Malicious PDF — malware analysis report

Static analysis result for SHA-256 31eee600ed84750f…

MALICIOUS

PDF

75.5 KB Created: 2021-06-12 03:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2af907ba36a32dde28854bc02dbdb113 SHA-1: 905387d55df66ab4247ad3f25ba469e2a01ea73d SHA-256: 31eee600ed84750f43c0316fbb768c192cf5a24207eb8c5c96e03f21cc9551a9
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 0.9956

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://pistant.ru/pbw?utm_term=best+free+stresser PDF link annotation
    • https://dunufofobepo.weebly.com/uploads/1/3/4/3/134380723/6143096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456116/normal_6027bafdbb24d.pdfIn PDF document text
    • https://pozanabuloga.weebly.com/uploads/1/3/4/3/134366917/sefifujovojamu-fulaxuzu-gumapila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_600c9c55bb31f.pdfIn PDF document text
    • https://legifufase.weebly.com/uploads/1/3/4/3/134349809/kemunanurobavobo.pdfIn PDF document text
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/dusewamozimat-dupodekijej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484093/normal_6001b921bd6b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447271/normal_60692fe176a91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_6045b87fa39f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454807/normal_5fe23639221d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_606d3b1340a5f.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/3990819.pdfIn PDF document text
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/jemamibul_ledibozivuxune.pdfIn PDF document text
    • https://miwefotuwid.weebly.com/uploads/1/3/0/9/130969826/f2870a34aa.pdfIn PDF document text
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/701ee4566f988.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/gogub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425506/normal_6032cdf192461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415944/normal_601b2c4ac4658.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144643848/ronataforowowojunitipono.pdfIn PDF document text
    • http://namimutigete.pbworks.com/f/how_to_evaluate_daily_fetal_movement_counts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8436dee7-1038-4143-8a37-e2c1cd2563ab/nipavujuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acea3fc2-2664-4ad1-a1a0-034a71ee3a74/dovoxopeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b50014d-3e91-458a-99e4-cf518868b1ff/51786789540.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/w/file/fetch/144758235/89438984906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc82c44-1679-4bd5-a4f8-2a0af132b1b5/can_you_get_covid_19_from_food_at_a_restaurant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c27260d-68d7-4df2-8fe4-f974c8683923/teamviewer_with_crack_kickass.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144819330/there_will_come_soft_rains_ray_bradbury_summary.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/f/betaxesokamukezimivalator.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_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 4568 bytes
SHA-256: 5634f0aeec4df657dc3b648a57b9ae80f0fbd591f4516b14f5a274ab9a07b020
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10796 bytes
SHA-256: 2c1f61a06909608eafc29a72e4ceb1e052ab264540873bb2d3440f6a87b37b25