Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cf52c7aafb1bc6…

MALICIOUS

PDF

64.4 KB Created: 2021-02-12 22:56:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cc1267b237331f94d7b2a667cf5066ce SHA-1: 3a480fd9629e7fb6f95ede3efdd04926d24b8247 SHA-256: f6cf52c7aafb1bc62d77a9327fa770a32d9b8e9052510302d9558f23247cf7c1
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic suggests a potential phishing or tech-support scam context, although the document body itself is heavily obfuscated and does not provide clear textual lures. No scripts were extracted from this sample.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/123?utm_term=plus+size+leather+skirt+canada PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380700/normal_5fcf1fcd54578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452594/normal_5fde4b2027d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_5fd9b1498fbb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386830/normal_5fc8dae5ba754.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/6330f7cb08e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_602096768f93e.pdfIn PDF document text
    • http://xakojudanek.66ghz.com/anlauttabelle_flex_und_flora.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/gebukil/libros_de_antroposofia.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/fallout_4_mod_load_order_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/drdo_ceptam_8_admit_card.pdfIn PDF document text
    • http://riwexakax.epizy.com/misoprostol_figo_guidelines.pdfIn PDF document text
    • http://nifopufu.epizy.com/argos_twin_telephone_answer_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/antivirus_app_360_security.pdfIn PDF document text
    • http://kiwaxebaka.rf.gd/dead_or_alive_xtreme_3_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/gozifukibifunikakejamip.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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 5140 bytes
SHA-256: dd8a5898314b1b0fd629bbc875a863b95cc446f80852f07f86e4f4e4ac6d4a46
font_01_sfnt_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 10268 bytes
SHA-256: 7d8d49f4619a8a9c8265916e96c3f61b05ad6d777914b3f584b6753493fd6c8b

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