Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b74ce773117b57…

MALICIOUS

PDF

88.0 KB Created: 2021-09-18 21:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a33604414001210e1228bfb5a947cae2 SHA-1: 38206e4640b4d6678ae7d468bb70ae554387557f SHA-256: 91b74ce773117b5772141c9e39f73b0b239ec12a9a06e0ad9e11f6f369d0f223
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to potentially malicious domains, indicating a phishing or link farm attack pattern. The 'SE_CALLBACK_LURE' heuristic suggests a callback phishing or tech-support scam pretext, aiming to trick users into interacting with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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://drafthe.ru/uplcv?utm_term=sefer+raziel+hamalakh+pdf PDF link annotation
    • http://tv-kitchen.ru/files/files/dibujeronutepugiwi.pdfIn PDF document text
    • http://decorstore.eu/upload/file/49804630222.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/wuxotuzilewiw.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/15b31f88c318a574b8880cad797a78b1/25515641041.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/kojevilofapufalibeg.pdfIn PDF document text
    • https://reniuved.it/file/nodarelowefanujiz.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/68200400728.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/18241497110.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/24511272074.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/1669478314.pdfIn PDF document text
    • http://nincity.de/inline/file/54802317348.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/70594139069.pdfIn PDF document text
    • https://virker-ikke.dk/files/59706657962.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/67836966339.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/vevawapevinajomelumux.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/8185972063.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/15875741993.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/77392561384.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/vesapa.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f2260330d48eeaac4f707df36afd3207/48160941061.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/13519275569.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 22180 bytes
SHA-256: 8ba6782f9da4aeefd2189c62764d9b11556c89ed5c383aa3d15dda8c3fafc025
font_01_sfnt_off000122f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 10500 bytes
SHA-256: 2bd6f7d24d0c76b6a2066baa3f2275305062740d20ce75bd84783268e9814372
font_02_sfnt_off00013acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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