Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a028d085be48780…

MALICIOUS

PDF

154.2 KB Created: 2021-03-15 21:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 571db17a8b39fb3d048d822f12450749 SHA-1: 5bdd60c169614093ce246d5cf709676a9c77515d SHA-256: 7a028d085be487803f26a075ee9f569b7117c0ddf853e69e831e32230ecfb9f9
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://zajinet.ru/123?utm_term=bushnell+tour+v3+slope+user+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490371/normal_6035be3a96f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_604792f9138d8.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/kumegasoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_5fe707a29ee16.pdfIn PDF document text
    • https://muverope.weebly.com/uploads/1/3/0/7/130776407/zatuwerakamonokanapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_6049070d5cc6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414494/normal_5ffd3950eb238.pdfIn PDF document text
    • https://zaronubiguxade.weebly.com/uploads/1/3/4/6/134685024/e4ef627e34e5.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/61616439337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_6041c25cd1f7d.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/1477545.pdfIn PDF document text
    • https://talosemes.weebly.com/uploads/1/3/4/4/134494853/lowupogu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413567/normal_5ff24ee0dccb9.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/rewasitul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_604d3ddd00c2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485689/normal_600028b632d45.pdfIn PDF document text
    • https://julupoberoraw.weebly.com/uploads/1/3/4/3/134353221/3410736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482671/normal_5fc8b541a9b4c.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/fe_review_manual_3rd_edition_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00021578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21578 5284 bytes
SHA-256: a048f909ce7c9920a98ffc8cb9dba6b83599314f7269a884b8f1e9128b8a3c1c
font_01_sfnt_off00022778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22778 17180 bytes
SHA-256: 4a9054a58eba6d218ccc75ea3ba59061b8fb5cca0eb0b463579e1b439580b372

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