Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b59cb37f6cfb35…

MALICIOUS

PDF

78.6 KB Created: 2021-06-03 07:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4220a3840bf07c5fabaa7d3feb78fb70 SHA-1: da063e367d1f4d6cade53c158b5b6aa588bf6676 SHA-256: f8b59cb37f6cfb354dc88da3ca5a9a39760f51e927d8d1b2d5899a74818f0ba5
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to a user manual, likely a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-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://lozipotod.ru/123?utm_term=easy512-+ac-+rc+user+manual
    • https://kinefowez.weebly.com/uploads/1/3/5/3/135329655/d449878c.pdf
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/5a2bdca721.pdf
    • https://fufijejelido.weebly.com/uploads/1/3/4/3/134351462/988727.pdf
    • https://bososotozakep.weebly.com/uploads/1/3/1/4/131437593/49f08.pdf
    • https://jiwazumirinupe.weebly.com/uploads/1/3/4/3/134352382/968831.pdf
    • https://robiwadanojiso.weebly.com/uploads/1/3/4/6/134644007/beb65aeaeb.pdf
    • https://cdn-cms.f-static.net/uploads/4446931/normal_602429342d1d4.pdf
    • https://xozejobe.weebly.com/uploads/1/3/1/4/131406614/7acdbe.pdf
    • https://cdn-cms.f-static.net/uploads/4491965/normal_6029e94f1dce7.pdf
    • https://cdn-cms.f-static.net/uploads/4447434/normal_6033a82943f8a.pdf
    • https://cdn-cms.f-static.net/uploads/4418783/normal_6068820b8a2d4.pdf
    • https://zusonuxegaza.weebly.com/uploads/1/3/1/4/131437774/da8bea8.pdf
    • https://wevofuru.weebly.com/uploads/1/3/4/6/134670173/eadca4d65cb365a.pdf
    • https://ferosikapomizud.weebly.com/uploads/1/3/4/5/134526037/1527997.pdf
    • https://cdn-cms.f-static.net/uploads/4450351/normal_600fc6931a962.pdf
    • https://sapixokevabose.weebly.com/uploads/1/3/4/4/134498139/9641362.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fd680cdf-c5e4-4cca-a8ec-db94acbaea97/gogibiji.pdf
    • https://uploads.strikinglycdn.com/files/14dc123f-800d-4b3f-885f-094dc818d35b/21580417884.pdf
    • http://giwupiraride.pbworks.com/f/95137326812.pdf
    • http://junerew.pbworks.com/f/how_to_read_washburn_guitar_serial_numbers.pdf
    • http://xawaren.pbworks.com/f/what_is_tuckmans_five_stage_model.pdf
    • http://xovelezid.pbworks.com/w/file/fetch/144416028/krunker_io_aimbot_free_no_download.pdf
    • http://nusuwoxub.pbworks.com/w/file/fetch/144413532/can_i_file_my_own_separation_agreement_in_nc.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_off0000f576.bin
8480af97ea8511286d92934693b3ceda499d917b3bc81a2a83088dc241e47ffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 5344 bytes
font_01_sfnt_off000107a4.bin
95790d2d352451626cc77c1c9b1e8b3844447564ba0164ad6b8ea525f0d0ca98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 10920 bytes

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