Malicious PDF — malware analysis report

Static analysis result for SHA-256 add63d2682785417…

MALICIOUS

PDF

77.2 KB Created: 2021-02-13 07:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7c675cd8bd27f429fa7859661562f543 SHA-1: 30917d3cef3d4eacbcabcbde3b0a0f77407d7d5a SHA-256: add63d268278541762da883a2fc8dd7acc181e5da1269c7c7c0638a1eb180d9b
186 Risk Score

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://leonvi.ru/wix?keyword=divine+marksman+pathfinder PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486751/normal_5fdaab2f704d9.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/aa406230a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_6010e627c692e.pdfIn PDF document text
    • http://redita.fun/1369858584301zcg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_6017be47da9b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_60262a9d44b8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490930/normal_5fe576cc6a94a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423732/normal_60085dee65115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_6014fa1c8cc41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wifudozakiteg.epizy.com/android_messages_rcs_update.pdfIn PDF document text
    • http://kepatuzazavew.epizy.com/bexaronewizegubezuvow.pdfIn PDF document text
    • http://xipitidugizen.rf.gd/wunoparaxokipekigagulujer.pdfIn PDF document text
    • http://zibemusisuvimal.rf.gd/51071453412.pdfIn PDF document text
    • http://totofexux.epizy.com/5218103184.pdfIn PDF document text
    • http://rebikesumusosu.rf.gd/23978535607.pdfIn PDF document text
    • http://memaded.epizy.com/adding_and_subtracting_integers_quiz_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 5048 bytes
SHA-256: 104ed5b6458a840396d26d0c17c04fbe46491724d8d01cb46a14b9508525f885
font_01_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10152 bytes
SHA-256: 8af351d9acf790f1069fe78dbc508b7ab9661193478958f69b4949e9070484af
font_02_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f