Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b52cd7eeb589958…

MALICIOUS

PDF

94.2 KB Created: 2021-03-10 00:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e9233b216c584f8dc9c65f1f5640ac9 SHA-1: 6783affee79252e29825d70f434bf3af2acd59cb SHA-256: 6b52cd7eeb589958c643a652b2555d264ccf53acc3a1e558f3ca936fbd40d0e3
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded links are indicative of a link farm, a common tactic for SEO poisoning or directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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/123?utm_term=bionote+halimbawa+pdf PDF link annotation
    • http://lizoguxumugef.mywebcommunity.org/graphic_design_portfolio_examples_reddit.pdfIn PDF document text
    • https://belifexemanugo.weebly.com/uploads/1/3/6/0/136051541/panigizabenu-popunovejax-woloxagosepuw-zoromuvolude.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/javofapadufofol.pdfIn PDF document text
    • https://cdn.sqhk.co/bibikodazit/hcjhMia/godlands_rpg_fight_for_throne_legendary_storyteller.pdfIn PDF document text
    • http://fidekeleko.medianewsonline.com/what_is_pellon_made_of.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/7jgFWha/xabesevifu.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/steering_the_craft_epub.pdfIn PDF document text
    • https://cdn.sqhk.co/subogutaze/juJhjS6/87144103213.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/1439167.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/fudogan.pdfIn PDF document text
    • http://procripton.com/cold_blooded_love_musicrcdhu.pdfIn PDF document text
    • http://videohost.space/grist_mill_inn_new_jerseyudr8o.pdfIn PDF document text
    • https://rekasefuwe.weebly.com/uploads/1/3/0/9/130969231/gemisafuv-wisotumomokuvo-fibomadulu-fewomi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/be91b750-77c8-459c-ab73-e0ca4943488c/kubler_ross_5_stages_of_grief_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab8d3d3-2691-4378-a4ed-93b0aade6b80/15587198105.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/run_android_apps_on_windows_10_mobile.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/how_much_does_marriage_counseling_cost_without_insurance.pdfIn PDF document text
    • http://pudosuvosav.atwebpages.com/color_theory_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/binuzafig.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/webiwodosomujibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5072910-a9bd-486d-8359-f8385da9e26f/tokyo_ghoul_season_2_episode_1_plot.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/gowelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/866ce750-f008-4ef9-a0b7-a7c310b4cb8a/64939218514.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/jepejis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0D 5076 bytes
SHA-256: 6d5826cf61660198ae6df5feac63ee422a6334144176dac81ed3abef90495c0f
font_01_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 11244 bytes
SHA-256: f34dddeaec3f7a3be65ebfefd4bb6f190be82bc7442a6c66e8f9a0e8f2617cf5
font_02_sfnt_off0001465e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465E 16180 bytes
SHA-256: cf8f50b7fe3e18837235b0fa435cdcf20701cf5086b9b5bec02d4afca0c84734
font_03_sfnt_off00015b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B78 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333