Malicious PDF — malware analysis report

Static analysis result for SHA-256 d500d7eed9f2708e…

MALICIOUS

PDF

72.1 KB Created: 2021-06-11 07:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b75614f72a6f65ceed02f7493f36d54c SHA-1: 3d46d43a39e30eb359cddaf50db84f392829939d SHA-256: d500d7eed9f2708e7e555313194c5ab328f1cf38962afb81055f22e7a77c8aca
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of embedded JavaScript, though obfuscated, further supports the malicious intent, likely to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://philabc.ru/pbw?utm_term=achyutam+keshavam+krishna+bhajan PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411717/normal_5fcf18ec89729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_606e78a0738d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459325/normal_600eabad6b08a.pdfIn PDF document text
    • https://pudakelujoroju.weebly.com/uploads/1/3/0/7/130739680/f5d1c97a23df336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425533/normal_5ff88b0634f5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369657/normal_5fdc19f95e792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_60565006c277d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_6022aed662378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_60606502b12e6.pdfIn PDF document text
    • https://jedumetunu.weebly.com/uploads/1/3/5/3/135388943/aa36f993351dc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456985/normal_6065ffacf3b82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pugaxigodaka.pbworks.com/w/file/fetch/144443307/gufugu.pdfIn PDF document text
    • http://dimutojopog.pbworks.com/f/word_problems_dividing_decimals_worksheets_6th_grade.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144523596/how_to_use_ion_color_brilliance_toner.pdfIn PDF document text
    • http://xovelezid.pbworks.com/w/file/fetch/144413979/arapa_klavye_indirmek_istiyorum.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144415248/star_wars_jedi_academy_no_cd_patch.pdfIn PDF document text
    • http://zolunegoli.pbworks.com/w/file/fetch/144560073/cmr_national_public_school_bangalore_fee_structure.pdfIn PDF document text
    • http://jumedew.pbworks.com/w/file/fetch/144844512/masepuxevipuv.pdfIn PDF document text
    • http://jagimikat.pbworks.com/f/proxy_to_xnxx.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 5208 bytes
SHA-256: 32e834d6a036f29539c97e3f7ff813a549238b0db7a3eaff726e15270014efcc
font_01_sfnt_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 10892 bytes
SHA-256: 144eadacb51e0b4b76a2038bcbe3145878841b1ee24dbb700b3c7130670d0a6b
font_02_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2