Malicious PDF — malware analysis report

Static analysis result for SHA-256 812905c34cf7f985…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 17:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5d24048a30fbb279242cc2c7d3c51502 SHA-1: 91a335173ddaf839f95dfbf7aa82e4b732d74460 SHA-256: 812905c34cf7f9854e2161d20d685c92fc0924abe311333f5676fbbaee213da7
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 0.9997

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://gimoguvi.ru/strik?utm_term=summer+baby+monitor+camera+hacked PDF link annotation
    • http://mx50off.pro/somanubifujovijoamo09.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/FViePtK/best_wallpapers_for_phone_free.pdfIn PDF document text
    • http://freefire-gifts.com/8984251375f1ghc.pdfIn PDF document text
    • http://complect-tech.ru/fonavubelivnyuc.pdfIn PDF document text
    • http://blablablacar.online/what_is_the_curriculum_for_you_and_why_is_it_importantzc3vd.pdfIn PDF document text
    • https://cdn.sqhk.co/bozawenibiwa/9009HEz/70897555242.pdfIn PDF document text
    • http://pixxel.life/aptitude_test_mcq_with_answerslx33g.pdfIn PDF document text
    • http://podarokinsta365.site/korigozimupunakugifcamq5.pdfIn PDF document text
    • http://anyita.space/el_dador_de_recuerdos_2paprz.pdfIn PDF document text
    • http://ru-1.casa/diranompok1.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/JRjbQgg/baliwovezexamomubevuzekev.pdfIn PDF document text
    • http://begetus11ppz.xyz/89084157598kxtq4.pdfIn PDF document text
    • http://fionainthefield.org/toro_timecutter_z4200_deck_partsktsbu.pdfIn PDF document text
    • http://help-ruleviolation.com/linear_system_theory_chen_solution_m5p9cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_719dbaa470134a3bbfbd94be9d799b08.pdf?index=trueIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_83c668ec4aef4e3f963850d0a6deda7a.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_a8c2c7563b2849149911e63e16f50f3d.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_bfa462d1e0f74217bd121944f21dc66f.pdf?index=trueIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_ca6e2789b5334380a077a5f21e586e0d.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_be65ee54ec2f43c9bcc786f898f0121c.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_5051d5f7ab2845fca0b175fdf98d15b1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 5376 bytes
SHA-256: bc950382c8a0a15463b8d318ecc2e8eda51d052457dd0c26eb760913f672900c
font_01_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 10996 bytes
SHA-256: 1c64ec8c64a16f1c9386137131f5a7d91d106861b2669780ef474d8b087c0621