Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1768dccaa3d090…

MALICIOUS

PDF

77.2 KB Created: 2021-02-26 21:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ebac1f2ee8330ed0f01f729b476a2d71 SHA-1: e362761c27ed3f80376e8ab8e5f4acc77cb00feb SHA-256: ba1768dccaa3d09059437b7a81fb8a3b716439b91183f1a39a1f43cc09675cdf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/123?utm_term=where+did+they+film+where%2527d+you+go+bernadette PDF link annotation
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/julul-labakowar.pdfIn PDF document text
    • http://in-step.shop/old_guillotine_ror2ywq5z.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/jgzqie5/edmodo_student_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410989/normal_600c362c92c20.pdfIn PDF document text
    • https://genofegewad.weebly.com/uploads/1/3/0/7/130776157/zixolo.pdfIn PDF document text
    • http://trikotoria.ru/54354502931ytxfi.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/3d23a15bccc.pdfIn PDF document text
    • http://soxezujep.iblogger.org/pebojadimemasuduji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_60246867d1fb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_601e0a7327cc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474446/normal_5ffcf1a3a1d9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_601a5ac76967a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bonutosi.rf.gd/gta_vice_city_all_cheats_list.pdfIn PDF document text
    • http://nikofutame.rf.gd/mazedozotifonunasal.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_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 5524 bytes
SHA-256: f51b8cd6b6df11003ad44c827d3e7053a0f12a2c337c765d0387b3527f2c9505
font_01_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 11496 bytes
SHA-256: daf10b61d3075b541af8943a6177cb4cce564b7b0f2ff2b27cecffc813b355a8

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