Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb12ba355bfccb9…

MALICIOUS

PDF

82.2 KB Created: 2021-03-25 10:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 37fe00de5e36cc6cb064d36f67da3a4c SHA-1: 15571462c3b212f33228b563512edfad2a4899cf SHA-256: bdb12ba355bfccb96e1e2e9f7722837f5b62551d986e5b70f16ad2305f7c3ea7
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's purpose is to redirect users to potentially harmful external sites.

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://baarspo.ru/award?keyword=antiemetico+embarazo+pdf PDF link annotation
    • http://ukranews.icu/74521267330wjzwn.pdfIn PDF document text
    • http://drilltech.info/ritiranyhq9d.pdfIn PDF document text
    • http://ganoroke.iblogger.org/pedirovagabupe.pdfIn PDF document text
    • https://cdn.sqhk.co/galudubujuwa/fhgmgiV/automatic_reply_outlook_2016_missing.pdfIn PDF document text
    • http://presalle.xyz/77836808240et2xq.pdfIn PDF document text
    • http://wordsidepost.top/cbse_private_online_exam_form_2019j0691.pdfIn PDF document text
    • http://babysampler.com/vikorisazovupifubd72j.pdfIn PDF document text
    • http://naturmilans.fun/calicut_university_distance_education_id_card33w33.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/diagimk/nabisofugotiwuga.pdfIn PDF document text
    • http://sehq.xyz/pewamajulolopote0whk8.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/jshclst/car_performance_chips_work.pdfIn PDF document text
    • http://copyrightshelpcenter.com/xeralajimukh2oi7.pdfIn PDF document text
    • http://table-wait.com/zixulabeloraberogazrwjj9.pdfIn PDF document text
    • http://pe50off.info/50804044367hc510.pdfIn PDF document text
    • http://kinoxca.xyz/kerafikugafatenowolugebx09up.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tenefotozefuzuw.rf.gd/79711244884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82016b36-8888-4c3d-855f-c9567bd6b0d5/vadekutetanigekot.pdfIn PDF document text
    • http://bafuxinasu.epizy.com/67456029766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d998483-9b36-4c87-a5aa-e74177011c2d/drum_beats_hip_hop.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_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 5268 bytes
SHA-256: 59625d49a874ad56e48ab53a361c236433f4b812c8434a715164ff85351e5e2d
font_01_sfnt_off000113bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BC 11904 bytes
SHA-256: 5b4e751cd5e5ab411a6feed7161a4e956e771b26d00c4de748c18e1845511110

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