Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4aa6087ed681b4c…

MALICIOUS

PDF

71.8 KB Created: 2020-11-12 18:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 56aabee1f9d1d72f0c3eeb16fefdaaff SHA-1: dc950df42a18d8cf94efc6ff9ad8d108d3cee6d9 SHA-256: d4aa6087ed681b4c55bd3d2adacbd64143ae2d2f687ba1bd4ad5a067db9e7654
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-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://trafficel.ru/123?utm_term=national+social+studies+standards+3rd+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5fa9d42b41f24.pdfIn PDF document text
    • https://zixulelivu.weebly.com/uploads/1/3/4/5/134507035/jawerididi-xanunixitewope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5f9a65cf5ab91.pdfIn PDF document text
    • https://nusutena.weebly.com/uploads/1/3/0/7/130739474/sijaxik_tinivitofadeg_xojugixufon_sajumutilagaxo.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/xarovimati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_5f939efccc825.pdfIn PDF document text
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/dunalogotepe.pdfIn PDF document text
    • https://ronisimene.weebly.com/uploads/1/3/4/6/134610282/7623887.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/besevonoduni-nawamenov.pdfIn PDF document text
    • https://warakamaluxib.weebly.com/uploads/1/3/4/3/134378328/550994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f926a0bc3f9f.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/mupukesunobaga/rifakodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e80bd5-c1d4-40ea-b082-f0b3568bef79/how_to_get_unlimited_money_in_csgo.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/vinakafejimalosopuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b1ab5e-9e99-4a6c-babc-0ac24819dc76/69549261328.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_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 5240 bytes
SHA-256: 4ce1d6ddad31779529a90a74495dd38e41d080622963bfdb3dabee147dd65d3a
font_01_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 10548 bytes
SHA-256: f863bd677d5b5a556bc7762113c4fb19f76ee214350ac2e4d5a7d115d7063463

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