Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9cfdbc3d2c335e…

MALICIOUS

PDF

84.0 KB Created: 2021-03-22 23:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4bca9b51864471287ba525db79742d09 SHA-1: 9f482e6839937e252ad4677d3f9e99fa0a83566f SHA-256: 1a9cfdbc3d2c335e45774e2c81fb6917bb09ecde38f24a2b6bc152ddebdb3392
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting pointing to external URIs. The embedded document body, though heavily obfuscated, contains text related to 'wkhtmltopdf' and a URL that is likely the primary lure. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=que+es+liderar+grupos+de+trabajo PDF link annotation
    • http://vegekezivujid.22web.org/soul_music_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/hkfji4O/color_prism_mandala_coloring_book.pdfIn PDF document text
    • http://poliredebelokaz.22web.org/is_site_reliability_engineer_a_good_job.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/CCGghhg/stay_alive_reprise_live.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/b9gjUje/86701480050.pdfIn PDF document text
    • http://wexigeziv.iblogger.org/what_is_the_need_for_primary_and_secondary_standards_in_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/hgVWIuZ/23113745015.pdfIn PDF document text
    • http://vefefex.iblogger.org/tx_nr636_onkyo.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/fjbWdhh/regulowikedazox.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/zunaporam/bc_hunting_guides_and_outfitters.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/aerobatics_performing_arts.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/xororigudus.pdfIn PDF document text
    • http://mizuselafu.rf.gd/67590736330.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/graphing_using_intercepts_worksheet.pdfIn PDF document text
    • http://sufelubunat.epizy.com/pasarodezegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f87811-9700-45f5-9157-d9de1bcffe75/48400334311.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/coleman_powermate_6250_generator_parts_manual.pdfIn PDF document text
    • http://rapodipowunifo.epizy.com/what_is_a_theoretical_framework_in_education.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/irregular_menstrual_bleeding_treatment_nice_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5355da58-bce5-49ae-bcd1-3917650a0244/6658996010.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_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 5180 bytes
SHA-256: 66c5d7c408bec66ae7fce165a0a014d9d9abca73d13c8ce5e0c7e049d68bbbc1
font_01_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 12088 bytes
SHA-256: 02a45d3a69c756f9b00c3a8e41bd05a948b8ce587f4aad953c869de1e4f370e9
font_02_sfnt_off000134af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.