Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1877cb356686995…

MALICIOUS

PDF

75.8 KB Created: 2021-03-19 07:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b177b5741cf6699c231c1a6fe8fac4de SHA-1: 9be96b8c68cb954f2e50767af57c7c3b45390ddb SHA-256: a1877cb35668699587462aec02fbc57b40c32f67707217935f6ff945e90bdfd3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://midufefew.ru/award?keyword=laporan+pendahuluan+asma+pdf+2020 PDF link annotation
    • https://gimepokik.weebly.com/uploads/1/3/1/6/131636980/pepigozowop_ferekab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_6019c50f1f529.pdfIn PDF document text
    • https://wekigenajelu.weebly.com/uploads/1/3/3/9/133999196/wifofozaxumudopunim.pdfIn PDF document text
    • https://puxasune.weebly.com/uploads/1/3/1/3/131379014/savuxefewosakeseri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489263/normal_6001119ea8f1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485572/normal_5fee88e01d22d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_6039a577f282b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_602a1e281bd48.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/pozikovekidizopudosujuybbkr.pdfIn PDF document text
    • http://poopo.ru/vampire_diaries_damon_actorfyhcc.pdfIn PDF document text
    • http://verifybadgehelp.com/names_of_angels_in_the_bible48p7q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482645/normal_6028852dbe6a6.pdfIn PDF document text
    • https://loxajutuwaguxi.weebly.com/uploads/1/3/2/6/132681393/wumaxusiteno_majaduxorogepi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/10988737624.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/49164239014.pdfIn PDF document text
    • http://ximipine.epizy.com/adobe_flash_player_getintopc.pdfIn PDF document text
    • http://degivenumi.epizy.com/38505538591.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_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 5496 bytes
SHA-256: 1072b00e19a1f252ab9a7956abf091b70c7864433c358a697a6104eb43cc76bf
font_01_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 10136 bytes
SHA-256: 29a65416ab7780c94775ae8413a3043e59e3ea0a52f67b95a046eeab1947fc36

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