Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d537431a98e41f…

MALICIOUS

PDF

94.4 KB Created: 2021-05-20 01:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 760c8ce0fbb1e59909c82a52fda6bb7f SHA-1: 789d24df4aafbc106b6bcc2660c3ac56d59f4ce5 SHA-256: 18d537431a98e41fe250a44eecc4f2285fcfc75d4e5bfa73e1274050cf62e3e6
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which are repeated and invisible, designed to trick the user into clicking them. One critical heuristic specifically identifies these as payload lures, pointing to the URL 'https://jacksth.ru/strik?utm_term=download+pes+2011+apk+%252B+data.rar' for a RAR download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • 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
  • 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=download+pes+2011+apk+%252B+data.rar In PDF document text
    • https://puluzoxaxidu.weebly.com/uploads/1/3/2/6/132683087/jotodezobuwumekevina.pdfIn PDF document text
    • https://zibezalobe.weebly.com/uploads/1/3/4/5/134529300/3054183.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/jopevefatalabaloz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_60510257687e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_6027f52b41ca5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e024890f-1077-4488-86e8-58445188b4e9/craftsman_1_2_hp_garage_door_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe81f24-3988-4db6-8b72-8e49bd332607/26471907197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6b0686-841a-4986-9e43-d5b1811d1fa2/we_did_it_when_we_were_young_lyrics_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f843876-c05b-42c3-b1a3-a28ebb822fb8/rowenta_steamer_dr7070_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0135f0-caf1-431d-917e-824bbd719d4e/top_covid_topics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2632f61c-9c66-4308-8575-e25a7f417f30/jumedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db70e448-136f-40d7-b7ee-6d1856f983b5/what_is_dsc_user.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277bb9fa-8a4c-459a-a574-6103f8c6819b/85191637680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc450af-acda-4589-849a-335f8b0e1c53/list_of_subordinating_conjunctions_and_their_functions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b21104aa-709e-487d-a4b8-b695fa6c11df/46591928905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/850c842b-e553-449a-896e-c98601b38712/50948752345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92995c52-49a5-40f0-87d5-2e5cb9c39233/the_night_before_christmas_vintage_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f527fa70-22c0-4c42-b65a-9fb2c246b1f1/tujowewotiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61105281-7889-4733-82a7-ae19abf546fa/22050560990.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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 5204 bytes
SHA-256: 0bf84d69a876f7fff7a6007ff295736d31e718679c21f4f9212eb38849d6a937
font_01_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 8200 bytes
SHA-256: dde256b54e38d0f1989a6ea75e768e4501003bd28f73a852d5567cc7be5a3cb7
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 11776 bytes
SHA-256: 6127f0c3a4e60cc8231e24eb0d994644f1939e2628976a05e79d5d479357c209
font_03_sfnt_off0001463f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463F 16260 bytes
SHA-256: 8ef9ccbd9264446120c89c24226b8cd10e4c146e003c7d9feddf4927c080b850
font_04_sfnt_off00015ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.