Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae767eacfa7abd91…

MALICIOUS

PDF

76.6 KB Created: 2021-04-03 21:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 89728c38aaba0483bc041d10d2aca3bd SHA-1: 04bfe221c14faa8b65b6f6e5e76974b609e4ac68 SHA-256: ae767eacfa7abd91337278c61fca161c696e038958c0ea95787bdb55c6272b77
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many pointing to disposable domains and hosting services, indicative of a link farm designed to distribute malicious content. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, combined with the heuristics, points towards a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=pdf+to+word+doc+converter+portable PDF link annotation
    • https://cdn.sqhk.co/zobazulibes/hbjejbM/vuluxirulo.pdfIn PDF document text
    • https://cdn.sqhk.co/vawikepaf/eihjjjc/lime_crime_diamond_crushers_pink_pearl.pdfIn PDF document text
    • http://milanomodaitaly.site/dawuzimexqqqyt.pdfIn PDF document text
    • http://znakomstva69.space/colt_ar_15_m4_carbine_reviewsmdp70.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/eb9b083224e922.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/zoHrgdY/hydro_dipping_guns_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/fotinegataso/5jhzPgj/pixel_launcher_oneplus_7_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/4hhgf44/club_penguin_psa_mission_4_guide.pdfIn PDF document text
    • https://xuwobonamufaguw.weebly.com/uploads/1/3/5/3/135315698/1499829.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/3Biaidy/71419735377.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/fhdjchI/mtg_phage_the_untouchable_combo.pdfIn PDF document text
    • http://senenetikoxikom.22web.org/45140271536.pdfIn PDF document text
    • https://nopirepogoduk.weebly.com/uploads/1/3/4/0/134095858/3055184.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/48wkUjc/4883567656.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5cc8be5-80c2-4a9b-9c5d-7fc66973dd07/google_maps_find_my_home.pdfIn PDF document text
    • http://mivolipo.epizy.com/jazigekamimosinolobog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95524fff-ec1b-4d7d-983b-e246c91e338b/57144242348.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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5264 bytes
SHA-256: 896ada1ccddcf06db02191d770a3b790860f2ddd04e126bfbc8d10d9eeb68f21
font_01_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 11048 bytes
SHA-256: 1c74184b33096ed5bd0172f8589d44cf3e03bf2f149ba9c88f86e239599177cf

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