Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1faec2a5eb5fc8…

MALICIOUS

PDF

74.2 KB Created: 2021-03-20 14:59:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2b1bb1b581d86dde9d5b24c106a2ff71 SHA-1: 539ad1f904a76f02d05caeb99685555a8f4733a1 SHA-256: 7a1faec2a5eb5fc857f62baa812d073f2022f8a9e40be5a213eae951be46eca2
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 0.9992

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://golowaki.ru/123?utm_term=american+express+logo+brand+guidelines PDF link annotation
    • http://bloomwithdeanna.com/2703402346zfko5.pdfIn PDF document text
    • https://cdn.sqhk.co/vonewesipan/ggaGJjg/31277631946.pdfIn PDF document text
    • http://duxojiz.iblogger.org/bavapolig.pdfIn PDF document text
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/5129038.pdfIn PDF document text
    • http://rastet-malysh.ru/60s_70_80_90s_music_radio_hits7q0xn.pdfIn PDF document text
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/rekepal.pdfIn PDF document text
    • http://xtina.online/59510139202akz50.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/ieGjfk2/91287284182.pdfIn PDF document text
    • https://cdn.sqhk.co/bawevabob/agihlgi/9215181995.pdfIn PDF document text
    • https://gosalojuwik.weebly.com/uploads/1/3/6/0/136050429/f4fc8735637c.pdfIn PDF document text
    • https://tedogiji.weebly.com/uploads/1/3/0/7/130775371/mobusetotifejol-lamukukanixas.pdfIn PDF document text
    • https://fobabunopana.weebly.com/uploads/1/3/0/9/130969757/9430406.pdfIn PDF document text
    • http://nulonelam.66ghz.com/global_competitiveness_report_2018_nigeria.pdfIn PDF document text
    • http://idealslimitaly-official.site/51111005431geygo.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/sgeXtjf/diy_slime_maker_game.pdfIn PDF document text
    • http://smartcreditus.info/zewovepadu5vvpw.pdfIn PDF document text
    • https://cdn.sqhk.co/nefikelifu/o6nhbif/podelukodokisofuledidamef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refewebol.epizy.com/amigos_para_siempre_nuty.pdfIn PDF document text
    • http://xajeladegafu.epizy.com/97937336606.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_f0fb63ce4acf4e4fbd4ec573491f9ea0.pdf?index=trueIn PDF document text
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_e6cb15d4b97f459aad17082b7281b18a.pdf?index=trueIn PDF document text
    • http://danofawo.rf.gd/fawovizetegisudexovo.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_6abaa77d3b4d4e5a802fdf6104dc594d.pdf?index=trueIn 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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 5588 bytes
SHA-256: 9e97ae6d64bb3ac241a47287464f7aaea14dc8b9f90d0d1473f854f35be0fa59
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 10784 bytes
SHA-256: a7776e1cc0f59cc92dfbc3a33a4c97f2b94748b7880a6b161a7cb3dad641355f

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