Malicious PDF — malware analysis report

Static analysis result for SHA-256 1595c17e79826913…

MALICIOUS

PDF

74.5 KB Created: 2020-12-25 23:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6067c6b9f433560179ca45f211b42ad SHA-1: 19ce17158b28bf72b74be7573d43dc9a857e1261 SHA-256: 1595c17e79826913f20760b36cae3a7462bc6a53b0e928e23ec630e6eb854280
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous embedded URLs that redirect to external sites, including a known malicious redirector. The document body, though heavily obfuscated, appears to contain metadata related to digital advertising and marketing manager responsibilities, suggesting a lure for users interested in such topics. The presence of multiple Weebly-hosted PDF links indicates a potential attempt to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://ggtraff.ru/strik?utm_term=digital+advertising+marketing+manager+responsibilities
    • https://mominebokax.weebly.com/uploads/1/3/4/8/134899741/36bdc744687.pdf
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/16f3be6dbe4.pdf
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/xajuxerunuxasi-wexujazawik-xiselibu.pdf
    • https://suxamoka.weebly.com/uploads/1/3/4/8/134876373/vagewozo.pdf
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/64049e0e0a.pdf
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/2332807.pdf
    • https://toguxobuse.weebly.com/uploads/1/3/4/9/134902292/wokur.pdf
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/vurigab.pdf
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/bolipawapu-fazitemisepa-vezib-tesat.pdf
    • https://cdn-cms.f-static.net/uploads/4479454/normal_5fa85923e2230.pdf
    • https://bosazafaxaku.weebly.com/uploads/1/3/1/3/131383721/daa192e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/03c43d98-e17e-4071-9774-7d01540ef6f5/kexigavajez.pdf
    • https://uploads.strikinglycdn.com/files/28d1a420-7709-4d88-a058-93d24e31ab78/xinesurexutapezovatuk.pdf
    • https://uploads.strikinglycdn.com/files/ebcaeb4c-4ec5-436d-8fd8-047771af74f7/93250869711.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e456.bin
713b02561767739f0ca01ceb1fb3899a091c2f241a7f5b3c1b3ee97d3ec197ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 5540 bytes
font_01_sfnt_off0000f71e.bin
e9242cfefa0a8ebf383098d51faa92491dd931cb376cf7fac8c7a48fbbdcd0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 11044 bytes

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