Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ca25e6305f86db…

MALICIOUS

PDF

64.1 KB Created: 2021-03-23 06:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 8783ce819aaa7effce6a7ccd5d2096af SHA-1: 419f587b13837501090746e2a94b1647b04b1ed0 SHA-256: a2ca25e6305f86db816eaf049a55635032abec606b11e8fba18c01e8469e3dc8
204 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The presence of multiple links on disposable hosting and the callback lure heuristic suggest a phishing or scam attempt designed to trick the user into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dafemum.ru/award?keyword=abbotic+xl+pdf In PDF document text
    • https://piladokad.weebly.com/uploads/1/3/4/7/134759874/9378597.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/how_to_find_all_gmail_account_by_phone_number.pdfIn PDF document text
    • https://tofujifudaxibav.weebly.com/uploads/1/3/5/3/135326414/dilirurevejud.pdfIn PDF document text
    • http://hightrade.club/tenigaj9jhkx.pdfIn PDF document text
    • https://luvatuxi.weebly.com/uploads/1/3/4/3/134321506/6145794.pdfIn PDF document text
    • http://igme.site/15165639709xy7as.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/kewovodavixikenila.pdfIn PDF document text
    • http://pedron.fun/verb_to_be_exercises_all_things_grammarw7ole.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/valores_y_antivalores_cristianos.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/do_stocks_go_down_over_the_weekend.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/share_jesus_without_fear.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/lusabifef/penuji.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/89765400471.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/75675429714.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/trumpet_christmas_music.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_off0000bfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCA 4860 bytes
SHA-256: 7e1d3ecab17529e4e7f8cb497cdf4e28b5636b76f156af5ff84896b3f6f0bd42
font_01_sfnt_off0000d070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD070 9912 bytes
SHA-256: bf2417bd61286aff41e077be80b9d9e578de8f09e0a085f8eeae7179b33cfbb9

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