Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cec562ca7683dcd…

MALICIOUS

PDF

75.0 KB Created: 2021-06-09 11:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d26313b12291740b827b2b49fd5b8e91 SHA-1: c33ee5196434a05226e23cfe717e9abba9e5a8b1 SHA-256: 4cec562ca7683dcddd9e460b7f7e6cd429ad820fb95cf0cfcc26f5e1736ba4e5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://crewmak.ru/pbw?utm_term=stardew+valley+guide+android PDF link annotation
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/dugesimagote.pdfIn PDF document text
    • https://bewimowijukoja.weebly.com/uploads/1/3/4/5/134584545/3b330bbf63fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455390/normal_6009b1451bf9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_603319fcd6c19.pdfIn PDF document text
    • https://giburonolunege.weebly.com/uploads/1/3/1/4/131406036/5c647066b93131f.pdfIn PDF document text
    • https://limogugopowara.weebly.com/uploads/1/3/1/6/131637055/pakulizemesetiwaf.pdfIn PDF document text
    • https://kuzasafeg.weebly.com/uploads/1/3/4/5/134586407/situtezo-bizesuzefibufu-dunawololumoja-xijuxomovanopap.pdfIn PDF document text
    • https://fojomifurinu.weebly.com/uploads/1/3/1/3/131378835/954ac561feba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_6014e75b7d2ae.pdfIn PDF document text
    • https://kodabovoxalomas.weebly.com/uploads/1/3/5/3/135340354/bogakawuwekaw-ruzipaxixevigok-pamitavugebob-kawonusez.pdfIn PDF document text
    • https://xifabaruwene.weebly.com/uploads/1/3/0/9/130969291/lamopetemug.pdfIn PDF document text
    • https://lovasevetoxe.weebly.com/uploads/1/3/4/4/134445156/dewuloworukazufal.pdfIn PDF document text
    • https://xedazebo.weebly.com/uploads/1/3/4/4/134497739/12a407756da900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473379/normal_5fee43f09997c.pdfIn PDF document text
    • https://javudufopatoka.weebly.com/uploads/1/3/1/6/131606124/xavunekorijo.pdfIn PDF document text
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/1264223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481156/normal_60550ef296a99.pdfIn PDF document text
    • https://guvoxokogavi.weebly.com/uploads/1/3/4/3/134374443/5708965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimotamiju.pbworks.com/f/full_body_gym_workout_beginner_female.pdfIn PDF document text
    • http://pibuluwopo.pbworks.com/w/file/fetch/144813756/download_pes_2011_android_apk__data_files.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/w/file/fetch/144575379/bajirao_mastani_tamil_movie_mp3_songs_free_download.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_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 5172 bytes
SHA-256: 49bdd0b4b1b02a9cbdb4cf899d8d1ede3272106b91e084eb364f4acce3d61a7e
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 13472 bytes
SHA-256: 3612fa6efbc4236976b12852a965289c7d2bdae0460ad28543a364a95bcc99c3

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