Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdb1845de7ec4f6…

MALICIOUS

PDF

95.2 KB Created: 2021-03-11 13:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 35d3ed7d6b02e6359ef404ad31be680b SHA-1: 1060d375967f6880ff73ffc3de3baf3a2928ee18 SHA-256: 1cdb1845de7ec4f621ed53f031b4e70ad289b501abe8ae1ea9a31b4df3715f8a
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://xajibur.ru/award?keyword=engineering+report+example+pdf PDF link annotation
    • https://cdn.sqhk.co/giganopof/hfc0vgj/class_9_maths_ncert_solutions_chapter_6._1.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/294813.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/sjhdVqW/home_electrical_switchboard_wiring.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/jfWFAia/fifa_20_fut_team_maker.pdfIn PDF document text
    • http://leafester.online/13782455332frqi6.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuzivo/qXjgNhd/xcom_enemy_within_long_war_console_commands.pdfIn PDF document text
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/xukufaxino_xasegage_dipurejuli_katinipa.pdfIn PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/1872920.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/bKMW4BJ/kuvojavorugazona.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/dnghYEr/murep.pdfIn PDF document text
    • https://zomereke.weebly.com/uploads/1/3/5/3/135397468/xitilupab_puvalogerijeber_garev_busota.pdfIn PDF document text
    • https://cdn.sqhk.co/mumepefofise/dxhc2fr/police_siren_effect_download.pdfIn PDF document text
    • https://wuziwewaramided.weebly.com/uploads/1/3/4/3/134311070/4069855.pdfIn PDF document text
    • https://cdn.sqhk.co/todipageb/eigRUhh/96311527929.pdfIn PDF document text
    • http://lunesygets.xyz/ejercicios_resueltos_complemento_directo_e_indirecto_2o_esoure45.pdfIn PDF document text
    • https://cdn.sqhk.co/bobofibu/rijjtJl/vector_gun_airsoft.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/zttidmc/xofogesigodifiwoj.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/f1cakge/74167316496.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/gcojftl/sony_srs_xb12_instruction_manual.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/bipovoromoj/math_worksheets_for_3rd_graders_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/adivasi_song_video_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/deruxiwomixupedu.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_off000139b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B9 5208 bytes
SHA-256: d951a7fb145ea7e793c6dd0d1fd6687a03572a1669ba0539f31da4b34fe5316c
font_01_sfnt_off00014b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B68 10604 bytes
SHA-256: 5018685ebb6f0e205246b250f97deea8faf76a740c1367e3a1e80735418c89e9

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