Malicious PDF — malware analysis report

Static analysis result for SHA-256 b055c3a68e9e1ebc…

MALICIOUS

PDF

101.5 KB Created: 2021-03-03 05:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dfbe572ecc6df79d7e421a6a3c14a515 SHA-1: f057dd175f7d17c7b4ff3e60c585d5da7774ba18 SHA-256: b055c3a68e9e1ebcd59fb9ff49df2292db97e792b34e29e0c52da1d02f86a1ce
126 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 5

  • 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 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://botokaw.ru/strik?utm_term=fallout+4+companion+guide+piper PDF link annotation
    • https://cdn.sqhk.co/sajatanugeg/hjvCgfB/blue_apron_menu_reviews.pdfIn PDF document text
    • https://tilakajunobeka.weebly.com/uploads/1/3/0/7/130739719/fiwob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_600d6b76f07e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393521/normal_5fdf68200d658.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/jKjgldi/tirek.pdfIn PDF document text
    • https://cdn.sqhk.co/nonobepimaf/bjfhejh/rubegezogor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_6025a48b42b02.pdfIn PDF document text
    • https://kakifiku.weebly.com/uploads/1/3/5/3/135347754/b07cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477138/normal_5ff9fec138e2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_6012c69cc5d9e.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/sipupagudijaji-jokazep-tazubapexoku-kepodomug.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/NiecjgL/kick_the_buddy_forever_android_oyun_club.pdfIn PDF document text
    • https://vuzowukuz.weebly.com/uploads/1/3/0/8/130814197/7956480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fcbde83b5ea6.pdfIn PDF document text
    • https://wusaworapivuwor.weebly.com/uploads/1/3/4/6/134659128/7dad74b7d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_6022921cd36e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_603e72f639f87.pdfIn PDF document text
    • https://vizokajobekaxa.weebly.com/uploads/1/3/0/9/130969885/65962.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tepoguko.epizy.com/ap_human_geography_review_unit_3.pdfIn PDF document text
    • http://zovawawopo.rf.gd/73199989766.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_off00015059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15059 5256 bytes
SHA-256: a015e74244a353e44ab049f5469ed871a6be981aef732e0ee31bd0da7b11575a
font_01_sfnt_off00016230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16230 11172 bytes
SHA-256: 3bd152f3fba1d3782c370f208f1da1d270bc6e3c747a202749c2f33453531f9d

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