Malicious PDF — malware analysis report

Static analysis result for SHA-256 befd6c2bb9528b66…

MALICIOUS

PDF

69.9 KB Created: 2021-02-21 18:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: af27589a744a38c1e7bf612b6d7e3434 SHA-1: fff8c83e7938f1652c4e02dc84eafb865257aa59 SHA-256: befd6c2bb9528b665aeff6c199e756d4ff30eb5b49d0482b09d7ed4c680473bc
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=samsung+hmx+f80+external+microphone In PDF document text
    • http://boost-store.net/maxawr1lk7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_6019033b494c8.pdfIn PDF document text
    • https://sudegefaxir.weebly.com/uploads/1/3/5/3/135323135/18b14bd3b907d9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478132/normal_60266388b7b34.pdfIn PDF document text
    • https://sajakuzotile.weebly.com/uploads/1/3/1/0/131071181/ledeberaxabow_sazirudofev_genewil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5fcce6e6c0df4.pdfIn PDF document text
    • http://top-agent.ru/303171164627hou.pdfIn PDF document text
    • https://benezome.weebly.com/uploads/1/3/5/4/135400217/5607771.pdfIn PDF document text
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/pateriza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367007/normal_5ff590ad56647.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5ff453be55002.pdfIn PDF document text
    • http://gnoogle.site/bangla_nacher_gaan_frees594g.pdfIn PDF document text
    • http://wejnpowk.space/60008222426xixf0.pdfIn PDF document text
    • https://jeboxalu.weebly.com/uploads/1/3/0/9/130969965/zufotewaxate_kusekipix_rukisaveritojel_tevanegupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 5936 bytes
SHA-256: 9d2271890e03cb305480084de277aa692ed34f54a1ca8b07203163da99c82390
font_01_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 11192 bytes
SHA-256: 2051104dc4470485bd97951a5eaa38061be2636764c53455b18d607c9cf07319

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