Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc3eabc1b750773…

MALICIOUS

PDF

94.3 KB Created: 2021-05-29 13:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ed24e5f17d373b97343db44a28c87916 SHA-1: 1e7d3a16dc4f0e9088d635ca808090606e4d114a SHA-256: 5cc3eabc1b750773ff33ef0b41ac79282035cc494aae26cfa99b3519a7ad2238
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=slither.io+hacked+apk+download PDF link annotation
    • https://wupifikuzokure.weebly.com/uploads/1/3/4/5/134529023/4322094.pdfIn PDF document text
    • https://fepiwifir.weebly.com/uploads/1/3/4/6/134676425/2100285.pdfIn PDF document text
    • https://fozoxusesabe.weebly.com/uploads/1/3/4/7/134748975/709894.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/6778448.pdfIn PDF document text
    • https://nurowilalivep.weebly.com/uploads/1/3/1/3/131380447/zudug.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/nowidakabizi_migurerogike_gitemorevo_siduza.pdfIn PDF document text
    • https://jemidezegin.weebly.com/uploads/1/3/0/8/130874295/d166c8c141.pdfIn PDF document text
    • https://vakipubar.weebly.com/uploads/1/3/7/5/137507767/kixonu.pdfIn PDF document text
    • https://molipose.weebly.com/uploads/1/3/4/6/134644393/zazemeduxesuruk-pudelozulex-vokakumisafi-sojukovuxivat.pdfIn PDF document text
    • https://tasoxagizuj.weebly.com/uploads/1/3/4/7/134734804/sovumovor.pdfIn PDF document text
    • https://bazitakitavame.weebly.com/uploads/1/3/5/3/135394276/921521b.pdfIn PDF document text
    • https://ragumavul.weebly.com/uploads/1/3/1/4/131483371/waxukutuxex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c27c723-40ab-4686-95be-6d97ed5ccb39/what_is_a_personal_background_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a18b0f5-6f3a-4ffc-93ad-5386727d916e/zotevitedewuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d95d8f-ba6e-4945-91ef-c7514c1588ec/medicare_claims_processing_manual_chapter_12_section_30.5.d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8f48e9-396b-4432-9934-3223b543f86d/how_often_to_eat_in_keto_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96adde6a-eb2a-4fbf-b7b1-1686acb189a8/roblox_robux_cheat_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e65a650a-1b67-4081-a853-51dc40081e3d/65153552464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d3298fe-cb82-4a59-91ea-57521c6273b5/shear_rate_blood_flow_velocity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ee36ae-05ef-44b2-8de2-73db51b7f978/21763322379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d20ddf-28f0-4cd3-822b-b277a720f144/matlab_bode_plot_axis_limits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30872de4-662c-49e7-ae7c-1b33451c5c82/reasons_to_stay_alive_by_matt_haig_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ea26b7-a4f3-4e7b-84a8-212a18bd42d9/26231699305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5e7ad5-5ebc-4113-a3ef-a485e5b5d1a0/kegogonizirisidozajutufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d34330-c50d-4537-a79b-d2f960382a8e/which_molecule_has_a_net_dipole_moment.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000139bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x139BB 27656 bytes
SHA-256: 9185a76c1e577b189247b6d423da5fe9432b7594f47791ff0176d75ec14d1620
font_00_sfnt_off00010189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 5276 bytes
SHA-256: e58148a82655fd73791bd7af2fc1c0546d3c6e294d498b3f537f74a64145db80
font_01_sfnt_off0001137f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 11180 bytes
SHA-256: 6f7cc5cd5b767e15e808ea6064960a05ea04dad6cc168a4b46a6ab19126055f3