Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f01618f023ebae…

MALICIOUS

PDF

73.7 KB Created: 2021-06-10 01:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22c2b9ba7169e2c7f74a67bcd2f8a548 SHA-1: d3ae2952327e98dbfb6df46d1bd057e4e43ef56b SHA-256: c4f01618f023ebae641ddd87b9531e5ee6c698f31f21b4f267ad06ab927b55b1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://huntic.ru/pbw?utm_term=bass+clef+practice+worksheet
    • https://bupekotarox.weebly.com/uploads/1/3/0/7/130739944/4016711.pdf
    • https://cdn-cms.f-static.net/uploads/4420239/normal_605c0b3b20cde.pdf
    • https://futinenapol.weebly.com/uploads/1/3/1/4/131438538/ninovobavawe.pdf
    • https://cdn-cms.f-static.net/uploads/4475861/normal_6011605d60e4c.pdf
    • https://ralubimuxafoku.weebly.com/uploads/1/3/4/3/134373731/tofotovanako_viren_buruk_zenuson.pdf
    • https://tesutubesonazi.weebly.com/uploads/1/3/4/6/134682982/tulisalef.pdf
    • https://cdn-cms.f-static.net/uploads/4489240/normal_5fd99cb261c92.pdf
    • https://cdn-cms.f-static.net/uploads/4475215/normal_6062499b17d46.pdf
    • https://kujivapepomo.weebly.com/uploads/1/3/4/5/134591142/rajoxagiwanomub-zibisukofire-tepotixu.pdf
    • https://minajekefejuwow.weebly.com/uploads/1/3/0/7/130776819/281b14.pdf
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5fd16ffb4b527.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nikekuva.pbworks.com/f/yu_gi_oh_forbidden_memories_pc_download_free.pdf
    • http://lodenapokot.pbworks.com/f/53576105196.pdf
    • https://uploads.strikinglycdn.com/files/100df512-9143-4ea6-a479-04192cbaff4a/kenmore_gas_stove_parts_list.pdf
    • http://fafukite.pbworks.com/w/file/fetch/144998139/free_stressers_that_actually_work.pdf
    • http://puzavofan.pbworks.com/f/wixum.pdf
    • https://uploads.strikinglycdn.com/files/93f2cf0d-d1d1-4c6d-9eed-0e9bf69c2f20/92711043547.pdf
    • http://dimutojopog.pbworks.com/w/file/fetch/144783849/adobe_photoshop_basic_tutorial_in_hindi.pdf
    • http://rimogeto.pbworks.com/f/44381953232.pdf
    • https://uploads.strikinglycdn.com/files/70989dc5-ffdd-4222-ad96-66fb67524e26/sundance_capri_880_price.pdf
    • http://ruzezotep.pbworks.com/f/videoder_windows_10_download.pdf
    • http://xidesux.pbworks.com/f/mini_militia_crack_version.pdf
    • http://xojifot.pbworks.com/f/86301481327.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_off0000dff7.bin
787dfa041ac69c4f2dc24ea1b0797e39e4010f75c6226998e63c9c0c2cd0a986
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 5308 bytes
font_01_sfnt_off0000f219.bin
739c40037c36eea3d4fde954af8dfaf5e2689a02a3a469226a3ce4b2bf36ece0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 10892 bytes