Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a30d26a66b1a3d…

MALICIOUS

PDF

76.3 KB Created: 2021-06-05 01:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6db7e0a5dd7500dfe18c87704c5a6f48 SHA-1: 123616ca8121d1f555455f11ace1135be4151608 SHA-256: 36a30d26a66b1a3db8d012fd4fbc922ed8b9c7463bb6d9b6929a71598d101135
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 0.9996

Heuristics 6

  • 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.
  • 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://inwebjor.ru/pbw?utm_term=how+to+protect+yourself+against+knife PDF link annotation
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/sonazegob_pirokotiso_tazab_parudenex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473053/normal_5febcc220df30.pdfIn PDF document text
    • https://xapukuzikoki.weebly.com/uploads/1/3/4/3/134381416/veluged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_5fd663eed8fad.pdfIn PDF document text
    • https://giximanuv.weebly.com/uploads/1/3/4/5/134526051/1115307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461485/normal_5ff4c20042a03.pdfIn PDF document text
    • https://defeluzeveloj.weebly.com/uploads/1/3/0/8/130873982/299fc051e29f69.pdfIn PDF document text
    • https://kizuwapeputatu.weebly.com/uploads/1/3/4/3/134375201/wugajigodifovev_nipegemugunul_dewexiziju.pdfIn PDF document text
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/runif.pdfIn PDF document text
    • https://mamijaba.weebly.com/uploads/1/3/4/6/134634293/e671bab5a353b.pdfIn PDF document text
    • https://wixefonimav.weebly.com/uploads/1/3/1/4/131437632/jiravipolip.pdfIn PDF document text
    • https://wizaxonaguwaxi.weebly.com/uploads/1/3/4/3/134306690/4c7b7a5af.pdfIn PDF document text
    • https://wadezadoli.weebly.com/uploads/1/3/0/9/130970015/9b581e8b5c.pdfIn PDF document text
    • https://zejifibesus.weebly.com/uploads/1/3/4/5/134586543/68be966748.pdfIn PDF document text
    • https://vowinerini.weebly.com/uploads/1/3/4/3/134385114/4192903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369189/normal_5ff0cc15180d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383586/normal_5ff6c5b390afa.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/8f9127ad-54b8-4b76-a120-518fc84bb0f7/how_to_set_up_sports_cam_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1dbab15-0fec-4fba-ad8a-f1ff757a6a28/56146138574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be512647-a190-4420-aff8-cbdb8012d61b/18071311562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111d1f62-31c1-4216-9ffa-30eed995f43f/kaplan_shortened_mcat_practice_test_reddit.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_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 5400 bytes
SHA-256: fd3017df14cd1b146022d94e4466cbe736339ba885b5061821ba5f433ada1264
font_01_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 10956 bytes
SHA-256: 02435831755ef3b6acb22a723a365303ccadedbbfced109aeeeb962f4e5d64dd

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