Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a32d5d4ab0bf76…

MALICIOUS

PDF

76.7 KB Created: 2021-04-26 04:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9cee0c587adcbe81aa130c1719c1bc2e SHA-1: 8561824c6030a40b7a2b99f6569b1409abe33e66 SHA-256: f3a32d5d4ab0bf766f8106a11b9454cbe289fd79eb0aaf2becabd2769d8d34d4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://zajinet.ru/strik?utm_term=christmas+guitar+sheet+music+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379220/normal_6009250de1555.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/bakebekonigebuwidat.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/waxel.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/pafabipadun.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410986/normal_5fedf267cf5ed.pdfIn PDF document text
    • https://cdn.sqhk.co/lidesoxu/zhgyhif/99846739143.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8d947d-98f1-49eb-bd2f-a68c56e44176/why_isnt_my_food_processor_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76c7292-4168-4739-bf27-e305e7aa3781/what_are_some_examples_of_group_incentives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8804a2c0-ddd8-4b3d-b2d3-c422c8579c61/air_force_reserve_officer_monthly_pay.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_2000250a46ab449a86efbd453bbf12af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fb1f71-08ad-4439-bf94-20c240fbf289/73141451969.pdfIn PDF document text
    • https://b6d28218-96ba-4f98-b9c1-0d78b4e6fe84.filesusr.com/ugd/47aa88_4abe802251d843f6a3e1044ae77b264a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5667f176-5c01-480c-9e68-4a7805a3cea8/old_skool_vans_red_check.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e4812f-ac46-4394-ad5c-5151f3c0686a/jesus_redeems_message_in_tamil_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b12808b-bf58-4364-acfa-8f69a4ffb80f/mevujuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0ebbd3-1701-439b-bd4a-a4bd8658201a/from_the_mixed_up_files_of_mrs_basil_movie_1995.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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 5440 bytes
SHA-256: a1d1eb4767723db1542094e7540fa0cb67e8227e24c35bb46b26d293adb5793a
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 10668 bytes
SHA-256: ab245deb201c88d6003be77b58ed0ae8600bb44bc8c74dc4569f56d2abe0edf7

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