Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a591e678b57125…

MALICIOUS

PDF

77.1 KB Created: 2021-02-17 00:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3be2a4abc0d60f717a7ae1e8b21d79dc SHA-1: dcfd5c437a874719086233727994a67b8c5420fc SHA-256: e7a591e678b571250e1a7fef00b84f3ac2e02ea76252e06e88a62f75a45dbe24
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary external links, https://leonvi.ru/strik?utm_term=potter+box+theory, is flagged as suspicious. ClamAV and ML classifiers also indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=potter+box+theory PDF link annotation
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/1889633.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/bibamobogasomamegame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fc8a580eca91.pdfIn PDF document text
    • https://vosumizajemuji.weebly.com/uploads/1/3/4/0/134041682/73f337de75468.pdfIn PDF document text
    • http://smilex.club/simile_metaphor_personification_examples0pqfh.pdfIn PDF document text
    • http://site-shop.xyz/v_live_atlanta_georgiadx2gk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417645/normal_60039544cec2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375344/normal_5feb4ae01240f.pdfIn PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/5a5ce6.pdfIn PDF document text
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/9017e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5fec35a452528.pdfIn PDF document text
    • http://banquepopulaire-fr.org/free_avast_antivirus_1_year_validitydb445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486368/normal_5ff81255cf109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_6003a21161687.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/0eb736c5e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387226/normal_5fce41724d02f.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://s3.amazonaws.com/ganubifirigevi/initial_d_series_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/boosted_performance_tuning.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/akinator_daily_challenge_answers_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/7242192082.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_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 4296 bytes
SHA-256: a4fda88c0d771845b5064c802dfa583e4cee9c7ac3ae2749abf1e93e3ddbed89
font_01_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 10360 bytes
SHA-256: 94819d0c479352e418c0d0fcf1ca093c828ed55fa0c0f59509136da92ab85f4d
font_02_sfnt_off0001195b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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