Malicious PDF — malware analysis report

Static analysis result for SHA-256 5966cb88712d44c5…

MALICIOUS

PDF

75.0 KB Created: 2021-03-09 21:30:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 356a03200b471483a86fd5cac85ec4ac SHA-1: b16c72d24e6591a5b3b209996a906f4adfc2e33b SHA-256: 5966cb88712d44c588ff0ea3403f88a2c56a89d45109145eacc9415bb87b2715
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier also indicate maliciousness, 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 0.9480

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://soxebez.ru/award?keyword=antologia+de+cuentos+de+terror+pdf PDF link annotation
    • http://dejuduz.22web.org/a_little_life_quotes_tumblr.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/mXEfjaO/dosev.pdfIn PDF document text
    • https://kefejuze.weebly.com/uploads/1/3/1/6/131606268/8770580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_600c1c0a08118.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/hggIii5/what_is_christianity_symbol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fc97916e2654.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/wopipaxegigej-pebujoxu-xasizanate.pdfIn PDF document text
    • http://dozawudefe.iblogger.org/56913846607.pdfIn PDF document text
    • https://kodalisurodufe.weebly.com/uploads/1/3/2/6/132680932/ratevarupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_600c35b443403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_60379ad328473.pdfIn PDF document text
    • https://cdn.sqhk.co/numexerab/djcUgdm/mandatory_reporting_vulnerable_adults_michigan.pdfIn PDF document text
    • https://xexiroxenokela.weebly.com/uploads/1/3/4/6/134613030/minarogen.pdfIn PDF document text
    • https://fozirufimagez.weebly.com/uploads/1/3/0/9/130969558/lirevewawexagal-nixuvasobipaj.pdfIn PDF document text
    • https://gokivasinu.weebly.com/uploads/1/3/4/3/134334496/4724649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 5196 bytes
SHA-256: 8a3353e48dc6b4365d5917551951ed5ad5fedc278a10d15a73a6aed5dc16baab
font_01_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 11460 bytes
SHA-256: 8d35e9387dbd7be2fbef66eba8d3e48a2160a605ded10b4b08204683bf2befad
font_02_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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