Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c39ba77d3e16183…

MALICIOUS

PDF

76.1 KB Created: 2021-04-06 22:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 805141b986997327a22544a229dc0965 SHA-1: 767f28dc75021b609e314b48ef86bb48a9cce970 SHA-256: 9c39ba77d3e161836dd67acee520b02f1c8421bb956aa328e695db95efd49649
126 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body contains a seemingly innocuous query about unit conversion, which is likely a lure to disguise the malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and link farms, strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=cuanto+es+30+mililitros+en+cucharadas PDF link annotation
    • http://voicebftyi.com/80110580433rpktv.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/ifCljbx/scruffy_to_fluffy_llc.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/dRyo7nJ/winagewijegojir.pdfIn PDF document text
    • http://derifupiwa.mypressonline.com/94808758760.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/hgcifde/vezavopox.pdfIn PDF document text
    • https://cdn.sqhk.co/moxawitab/hibG9hg/color_by_number_superhero_coloring_book.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/iHXqhhi/high_volume_ringtones_for_android_mobile_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vomawoko/gigB3ji/jemagukufakoresokijizeja.pdfIn PDF document text
    • https://cdn.sqhk.co/kelufuro/ieJiggf/tevobi.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/auRiije/pelitejap.pdfIn PDF document text
    • http://ompala.store/social_psychology_book_myershawgk.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/hgHhcLp/73798493618.pdfIn PDF document text
    • http://ionatr.fun/charam_sukh_web_series_freeo6jk1.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/1TIhgji/crazy_football_fans_pictures.pdfIn PDF document text
    • http://nebo-baikala.ru/arabic_fonts_free_for_windows_74dpzi.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/small_scale_enterprises_in_nigeria.pdfIn PDF document text
    • http://hrushch.space/791985475523dejd.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/kJiecVp/animals_names_and_sounds_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/hgehi47/final_fantasy_9_android_apk_ita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibubatovavav.atwebpages.com/atvio_tv_32_manual.pdfIn PDF document text
    • http://zujisofivo.onlinewebshop.net/wetijinazu.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_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 5388 bytes
SHA-256: 16ca24c0a018f3adfaee8e8726390386ee18a45e090188907a4ec9298327d4d9
font_01_sfnt_off0000fb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB12 11968 bytes
SHA-256: 1d58c3cf5c0c5b26d38cbc1c9115a2cf03be9d58bb781a6ba850e68b3b252ad2

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