Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8801ca6ef66e836…

MALICIOUS

PDF

114.1 KB Created: 2021-03-17 05:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b7cda447b12a2844dd4b0be15e35dc8 SHA-1: ea2b512f1a5b7fc8403d21a765c080902c3c2418 SHA-256: c8801ca6ef66e836f3d7abbcdeb0763b4544cdb74b8baf294a8ace9356e928c7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://dafemum.ru/strik?utm_term=garmin+forerunner+920xt+manual+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/zawatilirip/PhdJkij/94983242620.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/ar_15_parts_california_legal.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/jiwv0ha/ice_hockey_live_score_app.pdfIn PDF document text
    • http://rijexofugovu.medianewsonline.com/99632704255.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/fqhjjji/passport_photo_hair_colour_change.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/5hihigf/memipisexapakobusa.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/ibEF22D/divonapiladijagu.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/Kphhage/fashion_story_mod_apk_happymod.pdfIn PDF document text
    • https://cdn.sqhk.co/betarudigi/iH2hfjL/okra_flower_to_fruit_time.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/Jz8ggZH/tesaxolesiretarome.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/how_to_put_a_bobbin_in_a_sewing_machine_singer.pdfIn PDF document text
    • https://cdn.sqhk.co/widagawinud/7dqnSSS/meeting_notes_taking_template.pdfIn PDF document text
    • http://lulodexov.scienceontheweb.net/pabubuxusamegotigol.pdfIn PDF document text
    • http://ravevuzovije.mywebcommunity.org/english_grammar_vocabulary.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/XjiTpjc/mizebopiriputelobebadene.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/libro_el_poder_de_la_palabra_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosigegu.onlinewebshop.net/76673436006.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_114085804eca4b3fa3c70b90331cc59b.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_f788d096ed24433ba425fac8951b2abb.pdf?index=trueIn PDF document text
    • http://duxepivol.myartsonline.com/how_do_you_set_the_time_on_a_timex_indiglo_watch.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/slow_cooker_recipes_uk.pdfIn PDF document text
    • http://movasedumanepe.onlinewebshop.net/chemical_formula_list_download.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_d44474ce75584bf4b847376df38f6aee.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16642 5788 bytes
SHA-256: cb55680ae06a0d4112c6e3ecd19e66ba387d8eddfe566d8c035d6fce0998446a
font_01_sfnt_off000179a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A3 13628 bytes
SHA-256: d6d1ba1cc6b77615fcdc6b6e9e3b3c8cdb0fe7b91352f3fcd3c5bf79d163481d
font_02_sfnt_off0001a300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A300 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15