Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0c690a12c2b871…

MALICIOUS

PDF

95.2 KB Created: 2021-04-20 22:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 15ead0fb66174f9598512503d9346057 SHA-1: db72edf05280851cda13a4a4fd416adeb9caf13f SHA-256: 7c0c690a12c2b871fc297bfca974297575c1cae09f68791b27c3bc6c02f3b0f9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a 'PDF_SEO_LINK_FARM' which indicates a mass of external links. The ML classifier and ClamAV also identified it as malicious. The primary malicious URL observed is 'https://ponafet.ru/strik?utm_term=how+much+does+a+private+criminal+defense+attorney+make', which is likely used to redirect users to malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=how+much+does+a+private+criminal+defense+attorney+make PDF link annotation
    • https://cdn.sqhk.co/fapewakuw/jhhi8jg/pirates_of_the_caribbean_cast_member_costume.pdfIn PDF document text
    • https://cdn.sqhk.co/kipasewimoni/XBFiczG/game_dev_tycoon_ios_guide_sliders.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/miledu/xufuwedadetirek.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/chrome_windows_2012_r2.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/83069277522.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_cf258cc4fc104ff4b79815a5e01fc672.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosagoba/employment_verification_letter_template_for_immigration.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_79064985c62c4d43aefd65afd09ba32a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f9f5ed-f1b6-45c2-9f5a-3c24fbd0bf83/international_law_according_to_oppenheim.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/40537363232.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/7187385834.pdfIn PDF document text
    • http://lizavobamibo.rf.gd/cesarean_section_in_cow.pdfIn PDF document text
    • http://solazagu.epizy.com/8436190550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149ceca8-758d-439b-bb4d-5c35795a3437/lotiz.pdfIn PDF document text
    • http://jidolij.epizy.com/bozojuzemedo.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/51702632876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176dfcbd-d7c8-4dc7-9010-36263930ee46/xagiw.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/durinafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9856d9f1-5b2c-463f-b21a-271ae3d4ad8b/us_history_quiz_26.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_796a3dd64ed340878ce7cbf93dbc4732.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezetega/nikolewozip.pdfIn PDF document text
    • http://tibimixokafif.epizy.com/25246381647.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/64623557457.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_43b20863aaff4ffb9cad51db5456520a.pdf?index=trueIn PDF document text
    • https://78f5967e-1348-44d0-b43d-4fba71d4c3e7.filesusr.com/ugd/a94f6a_9bb89b7b7fc74a7e820f5524747852a8.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 5676 bytes
SHA-256: 21521f00ffef4b99a4971bf413f9c0676ee4f585a5c67b80af0800f450fa77a7
font_01_sfnt_off00013337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13337 11224 bytes
SHA-256: 962ed074af0136c7fb8acd017a3b3ec1a54a9b67113bef41fe2a93f1b71b199f
font_02_sfnt_off0001598e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1598E 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848