Malicious PDF — malware analysis report

Static analysis result for SHA-256 9164dc62851180d5…

MALICIOUS

PDF

71.3 KB Created: 2020-11-24 08:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8719af9823c829eb200638dd65f8a1a2 SHA-1: 2ce4af89306627b235b9e7c8430d7d3e25b82fb2 SHA-256: 9164dc62851180d51b0381551c991a7c95494d43d0cab79946791f367d3d8de7
156 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 0.9997

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 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.
  • 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://traffine.ru/123?utm_term=virus%252Fbacteria+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f8ad0830a66a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_5fb5dcaf4ffbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447095/normal_5fa4b37d2f77b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_5fbb328ca24f7.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/11604dc7532d10.pdfIn PDF document text
    • https://newajijamo.weebly.com/uploads/1/3/4/7/134750143/42120752719e5ec.pdfIn PDF document text
    • https://foravozivosuwu.weebly.com/uploads/1/3/4/0/134042788/lomidizokonoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413468/normal_5f94f5e68058d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5f94707b1ea19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zosevid/rodeo_stampede_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/22358727881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6db7085-e8c1-4f7b-aca4-5f6714589bd7/84716996346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51746219-decf-4f17-b6cb-fbc467e260e7/71004722819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a5198a-ca2d-412a-9686-809b6a9e9b16/deseguterosoxesefotifag.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3C 5136 bytes
SHA-256: cc3924814149aa6e5786eae88b34cae8caa1210b62e5d2f4d2faaa251bd3e7b7
font_01_sfnt_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 10268 bytes
SHA-256: edaffbf60b463b70a29c886448468776c4137f94a6ff667afdf026039fa0c5dc
font_02_sfnt_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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