Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c07d5ea172ffcf…

MALICIOUS

PDF

72.3 KB Created: 2021-01-11 17:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4743273fd96614795db0f5b9a10f6a9 SHA-1: 79c43a5a044d12480b5d78beea0eb400e13edfe7 SHA-256: 13c07d5ea172ffcf3821e2fccf30361bbf5cd23313f07281c200367b9534e430
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs that redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffmen.ru/aws?utm_term=letter+template+clipart+free
    • https://cdn.sqhk.co/murajefovel/iDsjasT/brawl_pixel_top_down_shooter_engine.pdf
    • https://tusatetop.weebly.com/uploads/1/3/1/4/131408029/65f26bd.pdf
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5f8fe12468bc9.pdf
    • https://static.s123-cdn-static.com/uploads/4449014/normal_5ff1c05b136f2.pdf
    • https://cdn-cms.f-static.net/uploads/4386828/normal_5fa219fa72e54.pdf
    • https://static.s123-cdn-static.com/uploads/4375705/normal_5fe372c561d89.pdf
    • https://cdn.sqhk.co/lamajemomu/heigges/one_punch_man_destiny_tier_list_roblox.pdf
    • https://static.s123-cdn-static.com/uploads/4414495/normal_5fed0192edfed.pdf
    • https://pefojefevofat.weebly.com/uploads/1/3/4/6/134659321/bosulavokidelub_zujusidirezem_vosabevatet.pdf
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/pilirunez.pdf
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/karuxamutanu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/waxapoz/law_of_success_napoleon_hill_quotes.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_off0000e163.bin
feedd4338a6c5b8bbec870fbda4e84b7ad7bddbbc05672bfafefc4015dbd3bf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 4924 bytes
font_01_sfnt_off0000f212.bin
492e3586971682c2283777f1056651fc49a31e421d468b7805e975e5789b8f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 10160 bytes

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