Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3e64330171fe09…

MALICIOUS

PDF

69.2 KB Created: 2021-05-20 23:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4324bf77420933f3b83ca3e58464de40 SHA-1: 545c0d6e56986bbc0858eab370c4ef049097e017 SHA-256: 2c3e64330171fe0949b4e34e1e500f9735fa79b38a186edb0d86e9b97355a4f7
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=the+world+war+1+christmas+truce+worksheet+answers+quizlet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501045/normal_5fd10bf1e5ff0.pdfIn PDF document text
    • https://vosafezedivoko.weebly.com/uploads/1/3/6/0/136095507/5782686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_603fe75ebcd1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379385/normal_5fde9eefde021.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477864/normal_5fc8d333851e3.pdfIn PDF document text
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/nozivesutesibom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480412/normal_604a5df70d630.pdfIn PDF document text
    • https://wexigovepabenu.weebly.com/uploads/1/3/0/7/130738565/9102632.pdfIn PDF document text
    • https://lirodute.weebly.com/uploads/1/3/1/8/131871659/fifunepowegorokipoje.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/tipoku-faruv-lamanasowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_603f4bc8dd113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_60476530234b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_602422e77fd35.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/nojidenodaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_60103c25c560a.pdfIn PDF document text
    • https://valezuxaj.weebly.com/uploads/1/3/4/6/134650604/tomutobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/943174a9-af71-42d3-b574-02ffb8a63770/38037497616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db766263-c7ff-47d4-9f30-312a4b46f40f/4811412482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cde7363-d078-4b43-9eea-f0b2e2ea4213/free_crochet_patterns_for_simple_scarves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a5ff3e-e144-42bf-abf9-e21588d6ef2b/32299128275.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_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 5512 bytes
SHA-256: b1afde7131b68f8027f2375a1639434610455ea5477925dd85c48699bfbd68b1
font_01_sfnt_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 9648 bytes
SHA-256: 666bbf9bcef2ec20a3647537bd44889f865e7e9328becf431a98793b1bd21c0e

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