Malicious PDF — malware analysis report

Static analysis result for SHA-256 084ca7727ca3ce02…

MALICIOUS

PDF

71.6 KB Created: 2021-06-11 06:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 91a2219fad43be188679162fbd1cc7bc SHA-1: 673884760501e7ed327d758ca97bb32fd2cc98d6 SHA-256: 084ca7727ca3ce026bba9e6faffb5c131dec3926fa4605146b14e27cb0127dcd
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 0.9998

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://catamma.ru/pbw?utm_term=phonics+worksheets+grade+2+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380675/normal_6038e73232217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476122/normal_5fe24ee565d9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473638/normal_5febb20e9fa4b.pdfIn PDF document text
    • https://wedufejaf.weebly.com/uploads/1/3/4/0/134018106/fonuvupe-gagikosirofut-rofamazojara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_5fd8cb791ff77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487423/normal_6069ea0e0d066.pdfIn PDF document text
    • https://datudotej.weebly.com/uploads/1/3/7/5/137511239/6688432.pdfIn PDF document text
    • https://nerukime.weebly.com/uploads/1/3/1/3/131379394/gifasapafofisizif.pdfIn PDF document text
    • https://zexerimapepu.weebly.com/uploads/1/3/2/6/132681444/5430476.pdfIn PDF document text
    • https://gifivetusox.weebly.com/uploads/1/3/4/7/134736849/risuseg_nasapivinorag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_6046625cbb541.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4385216/normal_60b6a84bd8c9b.pdfIn PDF document text
    • https://ruxosegid.weebly.com/uploads/1/3/4/2/134265817/13067.pdfIn PDF document text
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/2835184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501961/normal_5ff664fb5f243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_5fd15a0586a44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sekodegaxex.pbworks.com/f/warrior_cat_games_free.pdfIn PDF document text
    • http://ropotupi.pbworks.com/w/file/fetch/144613125/50800544038.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_off0000d9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EF 5676 bytes
SHA-256: 775cbeb7c28e4bbbd1c2f0f521605d542d2c9999a66266484b6a9f9e053ba95b
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10440 bytes
SHA-256: 22fd20bab71563a3b28049d1deebe229ed0b6ace75a9ee64464eff30969b92b7

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