Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb234e022f71b05…

MALICIOUS

PDF

66.5 KB Created: 2021-01-26 08:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9e8f9b10c8aa027b7cb47424d0102058 SHA-1: 2542d684271094b47c3803679bcca13f30515c0f SHA-256: 7cb234e022f71b05106be41dac87810ad89e197eb39459fff855f056b4d64681
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically pointing to 'trafficel.ru', suggesting a phishing or malware distribution lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the attack pattern of directing users to potentially harmful external sites.

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://trafficel.ru/123?utm_term=hola+que+tal+translate PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5ffb935f30ab4.pdfIn PDF document text
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/segibaren.pdfIn PDF document text
    • http://jodesomuxuduzu.22web.org/meberoxoburinufezux.pdfIn PDF document text
    • http://rexirututesopew.iblogger.org/adobe_premiere_pro_cs5_plugins_free.pdfIn PDF document text
    • http://medicalpracticementor.com/natural_color_gel_nail_polishzc266.pdfIn PDF document text
    • http://moneymaya.site/pixel_world_3d_pc_emulatorqm8k9.pdfIn PDF document text
    • https://mozovarowojexi.weebly.com/uploads/1/3/4/8/134867055/f357e8d24e52282.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/548982a.pdfIn PDF document text
    • http://probkin34.xyz/cat_warble_genus_cuterebraag0mt.pdfIn PDF document text
    • http://rmk4sale.xyz/bizikuwukokozeritojji84.pdfIn PDF document text
    • https://wixefonimav.weebly.com/uploads/1/3/1/4/131437632/d36da118375bdf5.pdfIn PDF document text
    • http://liolika-rsya.ru/wubamarijeximegopogam7zh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xakafof.rf.gd/world_earthquake_live_report.pdfIn PDF document text
    • http://sevuvev.epizy.com/soganak.pdfIn PDF document text
    • http://kazigolukujo.epizy.com/grand_budapest_hotel_parents_guide.pdfIn PDF document text
    • http://dexifuv.epizy.com/charminar_kannada_video_songs.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AF 4764 bytes
SHA-256: f0c57aab126c4fffdbf385524f8d1f3d529350019e8c48fc03b10d8892fb6032
font_01_sfnt_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 11956 bytes
SHA-256: d625b5e2c91925129c180e6e4d5a74193f0404095658ee50e56ad8109aebf950

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