Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaec5b5c2566c1ab…

MALICIOUS

PDF

78.6 KB Created: 2021-05-07 22:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ff4aeb1989bd555f86999ae5f4308a9 SHA-1: 9f342a00efe0a8d7069dd32202ad0a1148fbb41c SHA-256: eaec5b5c2566c1abb63bce82462ff5392418cd997c6c1287f0ef7fba59b5228d
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://leonvi.ru/strik?utm_term=mitchell+repair+estimator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368751/normal_606b6f7d360f2.pdfIn PDF document text
    • http://xexisutufas.iblogger.org/71022018172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_602e661803f40.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/ZghifrZ/download_zarchiver_mod_apkpure.pdfIn PDF document text
    • https://tawisowa.weebly.com/uploads/1/3/5/3/135315305/vafonogil.pdfIn PDF document text
    • https://zodurulamenuvud.weebly.com/uploads/1/3/5/9/135956643/7297599.pdfIn PDF document text
    • https://bakogala.weebly.com/uploads/1/3/1/3/131384254/fosokelifam.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/tebotez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_603ad659a5bdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444622/normal_5fcda28083024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371013/normal_5fc99aba0c56e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489263/normal_6033ba6692f33.pdfIn PDF document text
    • https://cdn.sqhk.co/lexikegije/ao4djbi/cheap_electronic_drum_set_amazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_6015da1b202dd.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/6897d445-5d36-4324-8aa5-893469ffa8a5/can_you_write_off_home_office_on_your_taxes.pdfIn PDF document text
    • http://dupizorof.rf.gd/jifujixibevax.pdfIn PDF document text
    • http://senakebuna.epizy.com/sapogej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d19b43d-d228-4075-9c68-d8f7e9d539b0/zuromibogejudofaxuwonu.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_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 5180 bytes
SHA-256: b9ee5a79f7dfb0a8bc0149d819df728f438c6dfb043ae14d81eb02572ba10bce
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 12044 bytes
SHA-256: 0f318445708bc17eab42194d219ff3f241824fff55b35d726efab2b70312563f

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