Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27abac85683ba49…

MALICIOUS

PDF

70.7 KB Created: 2021-02-22 18:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 583a2bc427c112f3856de10a2e1604d6 SHA-1: 49ef8cd61d70bf4c2b9071c6bd65959275ea1eae SHA-256: c27abac85683ba49a70873061b506084b98167567d19633b59ec2a9458ef51cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are disguised as search results or benign document titles, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

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://baarspo.ru/aws?utm_term=how+many+types+of+masons+are+there PDF link annotation
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/787654b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_601098c7b087b.pdfIn PDF document text
    • http://disetikala.22web.org/masezanijunetubumon.pdfIn PDF document text
    • https://togawakavepanef.weebly.com/uploads/1/3/1/1/131163752/22759.pdfIn PDF document text
    • https://cdn.sqhk.co/dipopoji/hd6FzCi/90013059414.pdfIn PDF document text
    • https://putajomarope.weebly.com/uploads/1/3/1/4/131437676/f0c415.pdfIn PDF document text
    • https://cdn.sqhk.co/pukefoxer/hagdhhU/doritiviloki.pdfIn PDF document text
    • https://zakuximonu.weebly.com/uploads/1/3/5/3/135346146/kowiselowinoraza.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/0ji6ia8/swat_team_meaning_in_software.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/gurafoga/appareil_uro_gnital_fminin.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/rasofatiraxapokute.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/49376490029.pdfIn PDF document text
    • http://jawuguv.epizy.com/mercedes_carsoft_7._4_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/hiatus_kaiyote_nakamarra_sheet_music.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_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 5264 bytes
SHA-256: 9ba17a73fbb3aa02c880934fd4e04f4380c2c075515a3ccef8c43d4f87144475
font_01_sfnt_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 11292 bytes
SHA-256: 78aa467de69c9f035ddbae0ef1575fd0992420904373dfeb5af25a82289d3a4e

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