Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2a0db20d69a890…

MALICIOUS

PDF

70.9 KB Created: 2021-02-25 04:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2741272ac79a47a166db6a21c6d6594 SHA-1: cecd92dafcc02ca60324acf87e7d77cac1fd84d4 SHA-256: 9b2a0db20d69a890dbc8a39a60c6d348d7c24c6775793dcb6a1d51a4f8b2481d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search term 'autocad 2018 guide book pdf', indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=autocad+2018+guide+book+pdf PDF link annotation
    • http://sukujemegamog.22web.org/34849341687.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371787/normal_60030a6e61118.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/kibawiwitedes_jejapuvuredo_pevipewul_limivixux.pdfIn PDF document text
    • http://cmbmarketing.agency/279146232449nt09.pdfIn PDF document text
    • http://pokupka.space/what_do_you_call_a_female_attorney4xp42.pdfIn PDF document text
    • http://meetsoda.pro/the_real_book_6th_edition_bass_clefv90ix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_6035dcfd0e6dc.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/vudowuribe-zenelaxes-puwanidovimaxup-pazulad.pdfIn PDF document text
    • http://sberpodarok2020.online/33458168846w1o7m.pdfIn PDF document text
    • http://zdorovienashevse.xyz/bao_thanh_thien_1993_fulllp9v5.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/xamokepepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_6030e7bbe7096.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/lomikafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_6033d3499c53b.pdfIn PDF document text
    • http://barekokodigak.iblogger.org/arithmetic_sequence_worksheet_48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufalirafuma.epizy.com/do_bounce_dryer_sheets_keep_bedbugs_away.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/18806475359.pdfIn PDF document text
    • http://ratazudawi.epizy.com/jotasobududonemibodigez.pdfIn PDF document text
    • http://zakivijojinikij.epizy.com/xivomodekep.pdfIn PDF document text
    • http://joxisuzu.rf.gd/windows_10_64_bit_free.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/62141255564.pdfIn PDF document text
    • http://mirimanomuropa.rf.gd/will_a_level_exams_take_place_in_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/8047606703.pdfIn PDF document text
    • http://sulegezusaz.epizy.com/1080p_sample_video_mp4.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_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 5732 bytes
SHA-256: 9895c05a05c76df7a307bdec296982d9e8dc548d58e4838a742de253acaf6f6a
font_01_sfnt_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 10236 bytes
SHA-256: 5ccf2827b618c8431cba5d8cbcd64639c5f13754c0fc5ccf5e5fc68583301535

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