Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25d4b3da7363f63…

MALICIOUS

PDF

68.9 KB Created: 2021-04-05 18:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d34651019452bd42eb9c2a5c446a20cb SHA-1: 728b93572e6ff5e8e246d988d95d72d25829f8df SHA-256: d25d4b3da7363f634b72106aec13357144208136bca2f75e76c5d83ef28f683f
146 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. The 'SE_CALLBACK_LURE' heuristic specifically indicates the document prompts the user to call a phone number in a context of billing, refund, or security issues. While no scripts were extracted, the presence of external URIs and the nature of the heuristics strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jacksth.ru/strik?utm_term=how+to+use+one+touch+ultra+meter PDF link annotation
    • https://cdn.sqhk.co/jekidase/jcjeyji/zubifulawo.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/2PZhbjj/4_pics_1_word_4_letters_pencil_ski.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/gozabafalekuzejejija1mtjp.pdfIn PDF document text
    • http://makeyourself.xyz/batman_the_dark_knight_returns_comic_summaryrjyqq.pdfIn PDF document text
    • http://uptodate.site/11209662401bkr1m.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/nebisikenupapaxoni.pdfIn PDF document text
    • http://sdfafq.info/xoruxuwitimh74h.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/automatic_control_engineering_raven_download.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/john_deere_455g_weight.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/dudujopixejikug/57522752205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2b8ddb-c649-4bb8-8d57-0e6816f7f101/minn_kota_812_autopilot_parts.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/9944366277.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/vedupetilebeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21724d2b-40aa-4add-bcb2-1302a1aa4ca3/rosemarys_baby_2014_full_movie_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef0a71c-8735-44f0-91dd-79647daee847/the_blue_book_for_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/what_is_a_good_diet_for_prostate_health.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/jinja2_exceptions_template_not_found.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_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 5092 bytes
SHA-256: 2f32a2b591269a9913f362c2f85a271c067a02b918431e063f2829668d76c6e8
font_01_sfnt_off0000e04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 10740 bytes
SHA-256: f44a02100db9cdeed0b37d42d9a067270ef4cd058f32574534e5f75d69073637

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