Malicious PDF — malware analysis report

Static analysis result for SHA-256 af12e707b2cde255…

MALICIOUS

PDF

78.8 KB Created: 2021-05-21 03:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c315436c3bb33e1097dd5dd806596847 SHA-1: 70e9fdff699643dcfcd6e70eab5e2fca375ffc57 SHA-256: af12e707b2cde25586da69c1fcc2ce30322689e41452a59e39bbf66443b4a382
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://midufefew.ru/strik?utm_term=best+selling+white+company+candle PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407314/normal_5fe03bd47e829.pdfIn PDF document text
    • https://gidaletibom.weebly.com/uploads/1/3/4/8/134881461/33ef59ab163a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_601de9b5b1e9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380694/normal_5ffb3eb48a15d.pdfIn PDF document text
    • https://jikonoligozeg.weebly.com/uploads/1/3/4/7/134755459/bawisozapud_domebowa_nomotinaf_wabonemavi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473954/normal_5feff58337764.pdfIn PDF document text
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/mumoxitoromafixo.pdfIn PDF document text
    • https://zofudugopevemob.weebly.com/uploads/1/3/1/6/131607066/023a83f9b.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/gurotos_kolobetujilun.pdfIn PDF document text
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/tekinodavusidapi.pdfIn PDF document text
    • https://tisawotaw.weebly.com/uploads/1/3/5/9/135993845/zekivuxex_dozurilokomumiv_xenujopoxonol_dizekufuxeximor.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/445ae965-5968-4880-b0d9-de9a24b92f7e/woxeju.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/25338686519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2eca46-c177-4800-87e9-549b3a2e575b/94501706851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e2981b-8b1c-4bf4-ba2d-85e5cf2baa76/38330416100.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/14515012335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b1fbec-0763-4cc6-bdf6-7f3530391b15/asus_tm-ac1900_merlin_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0306e754-832e-4101-b501-9a33260867a2/54499146239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f95044-94be-4f73-8048-7febe5bc325c/5234736039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742cdaaf-460e-45cb-b996-1079cca647d5/weather_quotes_in_wuthering_heights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e3a162-567d-4e71-b0e6-773f0d820ecd/wd_tv_hd_media_player_gen_2_custom_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/alien_shooter_2_mod_android_1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 5632 bytes
SHA-256: 84ea5476ca29a51436a303bc476d06cf21b7502ece2502a3e052c11812963758
font_01_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 10464 bytes
SHA-256: 1c243cbda8283b612a37b8346fab9dbd7c7f1edbae2c98c811631ccf775e5bd3