Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c44282e8514aa73…

MALICIOUS

PDF

77.4 KB Created: 2021-05-06 02:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0eb9bdea6f57df01e0b281113a0453bd SHA-1: ddc3ab3ff6321cbcf504f535f16f8708a92d8922 SHA-256: 8c44282e8514aa7380cd24e540f11a539486df7c03e61f89d880b5cbeb7dc21e
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=graco+hadley+4-in-1+convertible+crib+with+drawer+white PDF link annotation
    • http://jexekiraj.sportsontheweb.net/can_you_use_chi_keratin_mist_on_dry_hair.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/82181359401.pdfIn PDF document text
    • https://vomediwanuxorat.weebly.com/uploads/1/3/4/3/134327005/9516821.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/bebelejivumumujexal.pdfIn PDF document text
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/sasesamibubuf-rirovapamedelaz-xufawimof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383572/normal_5fc62c2d3133a.pdfIn PDF document text
    • http://japarof.mywebcommunity.org/15348825787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_602c30655925d.pdfIn PDF document text
    • https://gifoxulexup.weebly.com/uploads/1/3/4/8/134865115/9783fb1ee32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_60217824d9822.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/fosalizuzu/yookoso_workbook_answers_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/29844110320.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/nalebumiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8dbecec-93e9-41be-badd-48b700fc2b83/japad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ed8cc8-2d13-4101-9052-0e600d31380d/89951023252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87b7faa-47ab-410d-8bea-7b56822ba18c/what_are_the_10_stupidest_baby_names.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/chernobyl_hbo_1080p.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/michigan_child_support_payment_not_received.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6cab871-26be-4a7a-91c6-c6f3eef28dce/active_and_passive_voice_basic_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/37472526200.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_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 5444 bytes
SHA-256: 75caf8073187986ffffa5d051d7ad7a023a2f676802ce73e3e57d1d3a350ca35
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 11004 bytes
SHA-256: 391b710ef81987bd93d7f468dd6839fda90f77392486df6dd3c0dd84c6ee601f

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