Malicious PDF — malware analysis report

Static analysis result for SHA-256 96cf32f16bec1a3f…

MALICIOUS

PDF

75.6 KB Created: 2021-02-28 19:31:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8eb05f0ccc695df41ff5506dddec15f8 SHA-1: a38ce005b2cba2a636e69f78f3fd3a84aa41d22b SHA-256: 96cf32f16bec1a3f0e19efe178f8763209b77d607e8d5adb8150ad19d6264ef9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=ikea+bed+frame+king+malm PDF link annotation
    • http://goligofalu.medianewsonline.com/97085002942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_603821b265951.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/94066737764.pdfIn PDF document text
    • https://gepogixuzusesil.weebly.com/uploads/1/3/3/9/133999736/tabumid.pdfIn PDF document text
    • http://free-at.pro/positivismo_juridico_librosd0t74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412584/normal_6003c26b23d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_60172b16e776c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5fea3b864adf5.pdfIn PDF document text
    • http://timelessdecorum.com/periodic_table_song_in_englishwnwi0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500200/normal_600f62ee9aa6d.pdfIn PDF document text
    • https://gagofabujinu.weebly.com/uploads/1/3/0/7/130739012/015686776745.pdfIn PDF document text
    • https://jidugurulepapol.weebly.com/uploads/1/3/4/3/134310086/562ecc5c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_600a46a527d1a.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/how_to_make_chinese_lucky_bracelet.pdfIn PDF document text
    • http://gemotebefid.22web.org/ambalapuzha_unni_kannanodu_song_free.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/95620842652.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogetezapore.rf.gd/bibuker.pdfIn PDF document text
    • http://vapanuwivodoj.epizy.com/diameter_radius_circumference_worksheet.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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 5188 bytes
SHA-256: cf14a445193d0f588940f029415b3dbea45817cfd34195aa844dfd4cb7957129
font_01_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 10632 bytes
SHA-256: f324b4e99cc44474bd4113b6fa2e352d87309c417ffd3e78d5bcf3b115063798

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