Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e790aab7ea71b50…

MALICIOUS

PDF

74.0 KB Created: 2021-03-14 09:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06f18548f93ecf61156a2aa604e07ed8 SHA-1: 7527492cdfad00971306a357d2cb384569c67910 SHA-256: 7e790aab7ea71b5087e198777f7456fbb2c9f4d43318bd6baf5700fd45ce891a
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious websites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=listening+comprehension+test+worksheets
    • http://doctora.club/life_after_high_school_joyce_carol_of9rly.pdf
    • https://defuzeje.weebly.com/uploads/1/3/4/8/134883556/6768488.pdf
    • https://cdn-cms.f-static.net/uploads/4391015/normal_603e8cd533a71.pdf
    • https://static.s123-cdn-static.com/uploads/4456663/normal_5ffb631e72928.pdf
    • http://euroshopme.site/dinesodagofemobai8z22.pdf
    • https://matigolexa.weebly.com/uploads/1/3/2/6/132682665/zelewibupamusememun.pdf
    • https://cdn-cms.f-static.net/uploads/4387582/normal_6040ec8c086cd.pdf
    • https://static.s123-cdn-static.com/uploads/4470543/normal_5fcc8c8c494f2.pdf
    • http://miwewumexurigan.sportsontheweb.net/fejomunivowawe.pdf
    • https://static.s123-cdn-static.com/uploads/4470533/normal_5fe598174863b.pdf
    • http://igbusinessabouthelp.com/selivuxodoflbm1b.pdf
    • http://mobufuwiwid.medianewsonline.com/why_are_short_sentences_used_in_writing.pdf
    • https://vemosigexirapi.weebly.com/uploads/1/3/4/3/134387812/wutux.pdf
    • https://nofuzibid.weebly.com/uploads/1/3/1/4/131453406/namowewobekuxikisof.pdf
    • http://axecheat1.xyz/how_much_do_network_specialists_makejpzab.pdf
    • https://rurezakofone.weebly.com/uploads/1/3/1/1/131163981/sejatasi_julot.pdf
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/mavija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wadatenut.rf.gd/convert_improper_fraction_to_mixed_number_worksheet.pdf
    • http://didefoxesepu.rf.gd/dufubetexoxapaz.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_off0000e0e6.bin
06f764dca40966dcab780c2c374c8af001993576e2b1cb38e1b3684bec6a6b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 5200 bytes
font_01_sfnt_off0000f28e.bin
89d3086386da72c715c713c18bb3a363c6be016686b5eb9a58b5a51a35eca675		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 11320 bytes

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