Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a83196328f09c7…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 03:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8dc266dc1d6ad65f0f1b5b41ccb2a493 SHA-1: c8171fd6c1708d2edd1628060fe6eca0584b7e6d SHA-256: a5a83196328f09c754669eeecdd77794fab49d15836e64304b8a8e75a13b11ac
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, including a mass link farm and SEO redirectors, designed to trick users into downloading other files. The presence of UTM parameters in one of the primary URLs suggests a targeted phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/123?utm_term=charles+law+lab+report+introduction PDF link annotation
    • https://cdn.sqhk.co/sebixodof/eggzNgi/terminator_dark_fate_movie_link.pdfIn PDF document text
    • http://letabumo.getenjoyment.net/pragmatic_approach_to_research.pdfIn PDF document text
    • https://pelunukemuf.weebly.com/uploads/1/3/0/7/130776607/kuriberudelaj.pdfIn PDF document text
    • https://cdn.sqhk.co/suwefememe/VGgighl/xedimaxupituvujodogut.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/fd9d54a5.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/fyhbha1/95955928436.pdfIn PDF document text
    • https://kegixofuwo.weebly.com/uploads/1/3/4/5/134577478/muviperuson.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/tipaxefabevuvop_derozoz.pdfIn PDF document text
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/120d3cb1ad3d841.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/KjgiEje/43110179391.pdfIn PDF document text
    • https://cdn.sqhk.co/gasalikuviz/gddz5if/63367538729.pdfIn PDF document text
    • http://jovepodixowofow.mygamesonline.org/losur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/25089784362.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/what_is_the_equation_for_acceleration_due_to_gravity.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/all_justin_bieber_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/ashes_cricket_2013_game_utorrent.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/mejor_antivirus_tablet_android_gratis_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/99_acura_integra_maintenance_required_light.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/creation_tool_windows_10.pdfIn PDF document text
    • http://taberadajip.atwebpages.com/washington_gas_credit_union_login.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/how_to_check_google_maps_timeline.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/69583239700.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/52890347996.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/wilegajifaj.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/11286650762.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/meconium_delivery_guidelines.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_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 5296 bytes
SHA-256: a29d4d1440ec9f060ad36922b7a869ab3c6a625df67595fab4fa98d997116c5a
font_01_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 11248 bytes
SHA-256: c2ad2d14ba25733c34e1d5f7749f8228732d72a51f1c9c3217625640ac663c5c