Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9a83ebe64a004b…

MALICIOUS

PDF

82.0 KB Created: 2021-03-03 06:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d924199119b5b97c1a2cf2cff63fe383 SHA-1: dce86fc31755ab7378bd1e8686528fe4e8ae7bee SHA-256: 5d9a83ebe64a004b64be49e0aa11b82571dfd732076aaa64a7e92f81b3fd0a22
126 Risk Score

Malware Insights

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

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 0.9998

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://crophysi.ru/123?utm_term=tortilla+flat+book PDF link annotation
    • http://itclick.info/beats_solo_2_luxe_edition_bluetoothfkr8s.pdfIn PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/4836a575e546.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/gedew-xufaretedes-tiwubo-vinixobemevufa.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/persona_4_golden_true_ending_guide_spoiler_free.pdfIn PDF document text
    • http://effektzhizni.ru/best_games_online_free_normapg.pdfIn PDF document text
    • http://gdztut.com/how_many_times_larger_is_betelgeuse_than_the_sun1z380.pdfIn PDF document text
    • http://moresukko.ru/kinetic_and_potential_energy_calculations_answer_keylgtrq.pdfIn PDF document text
    • http://helplnstagram-confirm.com/batovomubocfn4d.pdfIn PDF document text
    • http://salebox.shop/waxomosoraxufezig6qnz9.pdfIn PDF document text
    • http://mnogoturov.com/missing_punctuation_worksheets_ks3iyggl.pdfIn PDF document text
    • http://xbet1.fun/how_long_does_it_take_to_charge_kindle5pt2h.pdfIn PDF document text
    • http://help-business-media.com/how_to_temporarily_fix_blown_head_gasket0qms7.pdfIn PDF document text
    • http://businessmentality.com/meripevisonovovilaxalojkjc3h.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://s3.amazonaws.com/jinotugiwomo/atwood_rv_hot_water_heater_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/blender_2._70_free_32_bit.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/did_they_ever_find_the_missing_argentine_submarine.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 4300 bytes
SHA-256: f104154502200c6979386de4a843676aeccacc9a9f4fda09b0d3caee47021fe8
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 10984 bytes
SHA-256: a200346d124b6e7a286d96b46aecb98b9aa638896843adcf298f6548c8146562
font_02_sfnt_off00012cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34