Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f29f7e13e9dc741…

MALICIOUS

PDF

74.3 KB Created: 2021-04-04 22:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8e0bacca232194e76888a323f7074e50 SHA-1: d436059ac74a1b967219a165138dd7f0fe0e738f SHA-256: 9f29f7e13e9dc741da10d2b59130c22f5941b824f66c0a36390350d4ebdd5cd0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://maypoin.ru/award?keyword=assistant+loco+pilot+exam+paper+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452851/normal_6064ac5f6dde5.pdfIn PDF document text
    • http://zitosuganenat.medianewsonline.com/aok_ahb_antrag.pdfIn PDF document text
    • http://importants.space/10692355307i4agc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_6054fc1256c3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_60400cd97070c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408992/normal_5fc7a483deef2.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/medical_billing_and_coding_for_dummies_free.pdfIn PDF document text
    • http://goodsun.space/498396980984t8rt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_5fdb397fd9619.pdfIn PDF document text
    • http://creditscorerepair.info/168608609089owil.pdfIn PDF document text
    • http://labebatazavanoz.mygamesonline.org/12x20_shed_plans_free.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/brookstone_bluetooth_speaker_big_blue_manual.pdfIn PDF document text
    • http://luminar4-download.xyz/resumen_de_un_grito_desesperadosicc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487200/normal_5fe5e7945bf71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457848/normal_604b26f348ec1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_f81c3611f1be4a31acf25c413716c863.pdf?index=trueIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_132c86bb27cf4d599d8abe4b23b2bba7.pdf?index=trueIn PDF document text
    • http://bugenerefajujus.atwebpages.com/can_the_police_arrest_you_without_evidence_uk.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_ff1c023f91cb479c817ead384ea15885.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_49a9bd252a3841b89285dbad3f903e0c.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_5e8bf6bfd67c46709975210888b96c26.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_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 5632 bytes
SHA-256: dcd7ebc60e2015a53b0c48def62e14e1ea0f28ce73d372a9172d3b0287674998
font_01_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 10776 bytes
SHA-256: 564e5225077305f34da0837de81d1e4570c9ad3e4521f156d5d6a1dd62fef35b