Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7a43bbb5569bf3…

MALICIOUS

PDF

72.5 KB Created: 2020-11-18 04:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b19b40e5945e809e46018a572ef10ff SHA-1: 5db35702d6ba1b74f741fa8de3aac4b35272e5af SHA-256: 2c7a43bbb5569bf3619785e0c030cae35b57fcc874eb74c12c534bba007d29c6
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains, indicating a link farm or redirection strategy. The presence of a link to a known malicious redirector and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-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.
  • 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/123?utm_term=persona+5+sun+fusion+guide
    • https://silemixijotin.weebly.com/uploads/1/3/4/4/134463531/pebunevuxe.pdf
    • https://zutovabofilosu.weebly.com/uploads/1/3/4/3/134333865/zamorode-rewag-volojej-javefuzatelibum.pdf
    • https://nugaramavamog.weebly.com/uploads/1/3/4/3/134320686/nifor.pdf
    • https://cdn-cms.f-static.net/uploads/4404122/normal_5f98245ba1700.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/roriturosiw.pdf
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f8e10adf310f.pdf
    • https://ruwalabipuges.weebly.com/uploads/1/3/4/4/134465281/lodapaduxeworageroxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jadere/raxifefuxivuwesisoxeko.pdf
    • https://uploads.strikinglycdn.com/files/d9d77cb8-6f6c-4ad9-851b-d9e5a2fe4978/sonejokenijufub.pdf
    • https://s3.amazonaws.com/naxizugenabi/presto_pressure_cooker_manual.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc84.bin
9424ad768aa6b3234e6555b59c40e5834ab603d4b47aec0e36a5de54958c5360		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 5168 bytes
font_01_sfnt_off0000de2a.bin
ef5d760a85712d15855dc580fb54c8a7d380fe44c46625fff05fc5ba0669934e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 9956 bytes
font_02_sfnt_off00010087.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 16092 bytes

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