Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3a784a67c5a9ca…

MALICIOUS

PDF

75.9 KB Created: 2020-11-11 19:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 862c929f457daf470402f4600cc225e3 SHA-1: d65ad54108f0b7849d54627832101d194f876e9e SHA-256: 1e3a784a67c5a9ca2214d21ee9957c2ca508d18ee16d98ab17fa370d671638ba
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing or trojan variant. The presence of numerous external links suggests an attempt to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafftec.ru/123?utm_term=labview+database+connectivity+toolkit+tutorial
    • https://tabefelob.weebly.com/uploads/1/3/4/3/134372343/4016007.pdf
    • https://gupugeja.weebly.com/uploads/1/3/4/2/134235999/5205969.pdf
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/3f3272eb.pdf
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/kasemagu_maparoxox.pdf
    • https://xoxilorimisutoz.weebly.com/uploads/1/3/4/7/134705863/540bbc4.pdf
    • https://cdn-cms.f-static.net/uploads/4410722/normal_5f9fca48ead44.pdf
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/rimujizunisu_dukovipuja.pdf
    • https://lawaxiwutaf.weebly.com/uploads/1/3/4/3/134356413/zufovuxir-tofoxuguratit-ladirisupusaji.pdf
    • https://setejera.weebly.com/uploads/1/3/4/6/134600318/muwetufigiwi_fufarujivu_wesutamipawe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rotafasaniz/the_corner_deli_trumbull_ct.pdf
    • https://s3.amazonaws.com/mupakijivuruzim/rags_to_riches_slope_intercept_form.pdf
    • https://s3.amazonaws.com/zubuwujoxom/microsoft_excel_for_android_apk.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_off0000ebc8.bin
9d75ffc0ca08e423fe767dfa0b63eda43e4206ec00a423e9d0448c5ad32d29e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 5332 bytes
font_01_sfnt_off0000fe14.bin
e36bbd0a525617c52d45a76ea015ec6c7ce9dbc57e2c9c109fb9a2f2780d1a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 10768 bytes

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