Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda6d075029bbc03…

MALICIOUS

PDF

107.4 KB Created: 2021-03-09 04:19:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6ba5749b1cf383cab2e984165dbbe746 SHA-1: e8dc617ce7c153cab63ae3692cc971bdac707b14 SHA-256: cda6d075029bbc0311cd19657ef5978f8bac8b30b9d25e67a5f34710e25deda7
194 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO spam or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dugedepap.ru/award?keyword=11th+zoology+book+in+tamil+pdf PDF link annotation
    • https://cdn.sqhk.co/bepesewutu/3icPOia/5370021099.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/eiejgNp/90_s_hit_hip_hop_songs.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/xevalovufow.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/LmhaP1S/8723721722.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/d72Gw9v/buzuvilu.pdfIn PDF document text
    • https://kelesive.weebly.com/uploads/1/3/0/8/130874426/pajupopuf.pdfIn PDF document text
    • https://fomoxejuj.weebly.com/uploads/1/3/4/0/134000143/4369685.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/gfhgeNL/revinureve.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/jEhcfhd/rurojoresededidexido.pdfIn PDF document text
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/bca3c7e569211ff.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/hcaNpcK/disney_heroes_battle_mode_mod_apk_1._9.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/1iaYhbJ/93698352908.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/rhiVXhc/ducks_unlimited_jobs_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/Usgjphh/mp3_music_player_crack_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/supopareso/dq4gdie/snake_xenzia_nokia_105.pdfIn PDF document text
    • https://cdn.sqhk.co/woragumokewi/eTCVpwb/wekemureridipilisimiw.pdfIn PDF document text
    • https://ruxetire.weebly.com/uploads/1/3/1/3/131379726/wigosefutifaxexek.pdfIn PDF document text
    • https://pajobozonojamu.weebly.com/uploads/1/3/3/9/133997184/516ba9928.pdfIn PDF document text
    • https://xowavexinoj.weebly.com/uploads/1/3/1/4/131408618/tinupi-votuwatirivujib-kozenu.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/diibAX2/fashion_fantasy_hack_online.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/2313004d-ff76-4ea4-a055-b11ebe501334/70244547813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ef1bc5-f82c-4dab-97f2-9f5d79e62d7a/34832625652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5550d37-b541-4e05-81fe-899a120171d3/26734605317.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00013ef0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13EF0 19680 bytes
SHA-256: 1a9aca5b67f37d897780c3a83ab0f1ad6abf2f598af0b874e246be47f3596341
font_00_sfnt_off00012c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 5496 bytes
SHA-256: eb4cdc0da5242476ca3772d48bff2224c1b243baf9a8adc26b3e46ee6dc3b25f
font_02_sfnt_off00016937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16937 13800 bytes
SHA-256: 6f4f2fc1062cda85129dcd5e14428544beddbf985ba2595c9d00477a114d5ad0
font_03_sfnt_off0001942a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1942A 2832 bytes
SHA-256: a12908a88df35a7e9eb57470e9a94a806bb52df392ce88a62d07cba2b79b9044

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