Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f41a5524d2f4a28…

MALICIOUS

PDF

76.3 KB Created: 2020-12-27 14:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 92b6f48b749126955c8cf5c87af5c44e SHA-1: 1efa94e6458f9b1cf5b1b219742f2e6bb9d9d11e SHA-256: 0f41a5524d2f4a28a5fdf0454e258b564e9025ea09958518c2057363761c69cc
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://trafffi.ru/strik?utm_term=words+in+words+game PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422368/normal_5fa7c1ffb3852.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/jiigfjj/zevemivokaliroxinara.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/jigic6u/57726041861.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/nekaxopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455639/normal_5fe02c2158c5b.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/baf42.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
    • https://uploads.strikinglycdn.com/files/966525d1-66e4-4e3f-b595-617dba064fbf/babubilavofipejipumuvede.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/answer_to_you_are_welcome.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/descargar_airdroid_apk_full_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/ms_excel_picklist.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/telebe.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/37016448274.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/damusakukasotozaromir.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/bollywood_movies_hd_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/pizexorukizelidugakafifom.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/ff14_class_leveling_guide.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 4928 bytes
SHA-256: ff1a1d19d2937b3c68d0dde5b12df8e4956a09d7e4cbad00e307ff3397de7a15
font_01_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 11124 bytes
SHA-256: cdad8deb093e0e6cad9bec81f0bcb0da4eb77415a725f36d3ec9007698d3f578
font_02_sfnt_off00011650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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