Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3edca83fc070cd…

MALICIOUS

PDF

75.2 KB Created: 2021-05-08 01:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d15e7bca8afd04724509b69ae1a7877c SHA-1: f241290a944930614525e50e63ade4f4ffb9d10e SHA-256: 7b3edca83fc070cd6dd409ccb8736c53d4a90161c962489e46faf1f21e979422
156 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 5

  • 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.
  • 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://vilenefex.ru/strik?utm_term=filipino+foods+rich+in+calories PDF link annotation
    • https://cdn.sqhk.co/jipogidara/jaxgjhf/ncaa_basketball_championship_2020_odds.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/LMgephf/gofanagikab.pdfIn PDF document text
    • https://cdn.sqhk.co/wegifopi/jfjfyhg/bigatanexodulifekaruv.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/QKFe7jb/45820747760.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/ibUifbd/influenced_item_divination_card.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/e76d33d1-cbf9-4bda-b033-708910b6a76a/how_to_determine_safe_bearing_capacity_of_soil.pdfIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_aca6e18609934416a025d3cd95e002cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/759ee0c0-7bae-40bb-905c-911953ef0351/54253188695.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/bengali_movies_free_website.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_a80bbb90130a420c9f719f25eca5e66d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00a3900-e26e-48c7-ade7-e81f07c80af9/wimoratikajofadowop.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/13500375325.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/8005192427.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/husky_hvlp_spray_gun_assembly.pdfIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_f0004a4f96b54f09944c1c9709749853.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/80250855227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d9c43a-8212-44fc-8a23-4d02fa874ea7/12940819039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a269ee-f741-4d4d-b19a-7e10b46d3813/python_setup.py_sdist.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/99356329895.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_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 5196 bytes
SHA-256: d3ce5321fdafc34afc901b1403ecb704521ac436ffa524fa40a4d3f177525036
font_01_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 10924 bytes
SHA-256: 0fde08967e522d7e7492d2f4db45d26160df4a43af24f6771658b33928134445

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