Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b01ac3cc29eaef…

MALICIOUS

PDF

75.8 KB Created: 2021-03-04 12:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: da63905ff60d4113d49a50eeb0892bdc SHA-1: a0b76cc0ae72c41bf0b2d26dda0f3ff6c6a2cf07 SHA-256: b6b01ac3cc29eaef9ad2ec8f4b721e51aa4788fbaf06d4dd6004bb7b097e8a60
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=final+fantasy+7+remake+chapter+14+resolutions+guide PDF link annotation
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/be58a69aeaba90.pdfIn PDF document text
    • https://goradexajegofip.weebly.com/uploads/1/3/0/8/130874122/ginuganesadol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_600721e240823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5ffe552ca15fa.pdfIn PDF document text
    • http://bipogumaguwe.22web.org/turopur.pdfIn PDF document text
    • http://bazegal.iblogger.org/96493866431.pdfIn PDF document text
    • https://fewugoxozo.weebly.com/uploads/1/3/4/4/134441687/97eb9ce5703e0.pdfIn PDF document text
    • https://setejurisu.weebly.com/uploads/1/3/2/7/132740540/be510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_60305a54a3c41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379618/normal_5fcaf38510dbe.pdfIn PDF document text
    • https://puxonuge.weebly.com/uploads/1/3/1/3/131383548/2254025.pdfIn PDF document text
    • https://muwemobivom.weebly.com/uploads/1/3/0/7/130776082/vepenizotuzomisuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452853/normal_5fe135ed914ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tunozesanapi.rf.gd/fotutavunusufeborosu.pdfIn PDF document text
    • http://gelepovasogadax.epizy.com/cultus_lake_oregon_fishing_report.pdfIn PDF document text
    • http://rapuwovire.rf.gd/the_land_of_stories_movie_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/7065226677.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/react_lifecycle_cheat_sheet.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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 5912 bytes
SHA-256: a376bc84a4c892250f280699b4ed8319af063bbe600bc09707259ba7c6205f0e
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 11168 bytes
SHA-256: 593ee1a2925a411adccfaa6ef89f4b6048dbc7d6becf8da8556f78a52bbfb57c

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