Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea86ee351e03476…

MALICIOUS

PDF

99.8 KB Created: 2021-06-08 18:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 27f977f60ee12a14b42730759b307fb0 SHA-1: 6a376f196f7f97baadb2432c57a4bed10f62583c SHA-256: eea86ee351e034769501f8cd18d55bcd507bb0bed07fd267b57726db1f685437
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm or SEO spam. The primary URL, 'https://pistant.ru/pbw?utm_term=diablo+3+player+numbers', indicates a lure related to game player numbers, likely to attract clicks. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or traffic-driving scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/pbw?utm_term=diablo+3+player+numbers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459054/normal_602ae284ccf4d.pdfIn PDF document text
    • https://dexixafavako.weebly.com/uploads/1/3/4/3/134348567/kafem-vanow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447271/normal_6010d9d974233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_6058e1b12f96b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370543/normal_5ffc0f447349e.pdfIn PDF document text
    • https://kufudiketexolut.weebly.com/uploads/1/3/4/0/134096890/ninodemasa-mubojuwuvofe-zuperitow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383572/normal_601ae441d4007.pdfIn PDF document text
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/buguzujejif_lonevatil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6010c1cc4a778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_60171734f3582.pdfIn PDF document text
    • https://daxogane.weebly.com/uploads/1/3/2/8/132815110/b0da1db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_604f69a91d60c.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/duvujimapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_60648830d03b4.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/126248c2b.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/ea769d33-9254-44a5-ab30-d8873f15fb40/12.4_independent_practice_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3e75c7-b92d-4613-b51d-081371ca66d2/jepiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e37e0f3-16a5-41ae-84d9-073947550c9e/what_radio_station_is_the_blue_jackets_game_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc82ba19-7de4-4371-9ecb-7822919d9ec6/duwolabulitumuwovaveb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264b7e8b-1948-46a9-85af-e16163cb3e1b/black_mens_hairstyles_for_short_hair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999da614-37d2-4659-bd7d-1b2b6f1bcb3a/15324542434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f367e4b2-e03c-4a67-bb94-a23af4c5623d/how_to_reset_maytag_epic_z_dryer.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_off00013811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13811 5172 bytes
SHA-256: 73455deddc001866ba68913d35e6056a7166dc1e1cfc67d3193802558c094193
font_01_sfnt_off00014976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14976 12508 bytes
SHA-256: 8658649fcba4a7371bc909c461baf668dd22f5576709937070e4861f360693cb
font_02_sfnt_off000173a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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