Malicious PDF — malware analysis report

Static analysis result for SHA-256 053b7d4a58dadc63…

MALICIOUS

PDF

107.1 KB Created: 2020-11-20 04:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5b107a6e9878a4ecfd9fcba8afec12df SHA-1: 96a5691ab7b17c74d898cf620c98ee5cf133cd7a SHA-256: 053b7d4a58dadc630c17c6898431faaa0cd2c5ed1108eba4630fc0c3b87a6f3a
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 0.9997

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://traffset.ru/strik?utm_term=what+is+the+significance+of+blocks+b PDF link annotation
    • https://xinejusitap.weebly.com/uploads/1/3/4/6/134630468/7786932.pdfIn PDF document text
    • https://tizemafuniture.weebly.com/uploads/1/3/4/6/134636649/3961410.pdfIn PDF document text
    • https://nezejigon.weebly.com/uploads/1/3/4/6/134611081/wadekitumaxovu-pamujavotadi-kimujuxijubek.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/vejixinilezo.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/caa64.pdfIn PDF document text
    • https://kerixigepib.weebly.com/uploads/1/3/4/2/134235482/kodiwefete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/35852144415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afae5af2-32a5-41a1-bf8b-cdb19694267a/1998_polaris_trailblazer_250_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746ecc6b-cd96-4b1b-8f86-96c9ea9da0cf/gexelipuzagakopazidebodep.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/vshare_free_ios_10._3._3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b99bb3-b2ba-4bc5-971b-84c893d46c46/14457150384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec9bc51-7cb2-4162-8a68-0f36293a803b/mewezokevekawazegiridik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5202ebc-015a-4f59-a60e-78ffadabb1b6/94596823840.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001268f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268F 20236 bytes
SHA-256: cb8df0610c00c1292a5e150e2648ecbf46c742093503201bed004ab513d12e76
font_01_sfnt_off000163fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FA 5264 bytes
SHA-256: 98b8945a8ec024ad8a72d10436a6fe5f475d757eda96c4ddb1f904c3bf18dbc6
font_02_sfnt_off000175f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F8 12068 bytes
SHA-256: aa9914696943431f2e434230142b1b2f674657e39c6d2b101508569446390c74

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