Malicious PDF — malware analysis report

Static analysis result for SHA-256 393a46940a3d26ba…

MALICIOUS

PDF

96.0 KB Created: 2021-04-23 05:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: df719d21e69d98b98022aaf9fc774964 SHA-1: dec4ce3d8636090846725c80cb84109a2c2f0888 SHA-256: 393a46940a3d26baa74b35703f477d64aae2921fd50ef1f3824e2136d2889e73
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 0.9988

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://bologen.ru/strik?utm_term=anime+girl+drawing+easy+step+by+step+full+body PDF link annotation
    • https://dejerolet.weebly.com/uploads/1/3/4/4/134444382/vugobopujisanezetu.pdfIn PDF document text
    • https://ramazupefedaze.weebly.com/uploads/1/3/5/3/135336263/1e7e01.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/heieCjc/kulemusom.pdfIn PDF document text
    • http://spainwow.pro/how_to_do_the_aa_12_stepsetlge.pdfIn PDF document text
    • https://mujolopiwajini.weebly.com/uploads/1/3/4/3/134379833/kowidozodamikexoboj.pdfIn PDF document text
    • https://tumumasozoborux.weebly.com/uploads/1/3/1/4/131453535/3858401.pdfIn PDF document text
    • http://excellent-spb.ru/define_magisterial_reformationu81re.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/jbJAhc4/35503121866.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/erhfWHb/soccer_tactics_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuzorumuji/djh9gi9/90s_r_b_music_videos_be_like.pdfIn PDF document text
    • https://cdn.sqhk.co/pometobab/hbmbefB/liwunibetobisajunite.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/aggKcjb/waukee_ice_cream_shoppe_menu.pdfIn PDF document text
    • http://osthondroz.com/twas_the_night_before_christmas_words0pc8c.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/cSjg3GU/godosizo.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/ejcgihi/painting_classes_near_me_for_fun.pdfIn PDF document text
    • http://normaa-id.com/fipoli7z13o.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/8644f920-e623-46e8-8e4d-9b7e19bcfa77/wd_my_cloud_home_duo_personal_cloud_storage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0028974-b4d8-47c7-b771-b92a4a11c02a/biguniwegorivexoti.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_4d927ebf86f84ddfabe4ee0f1be243c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac54a19-bc0b-4173-b7b8-bf69f94b02df/regomugizer.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_e354be4b8ee64335aac0f836e489f680.pdf?index=trueIn PDF document text
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_8a9d0d3eeb424a6d88a47255ebe4e058.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_c38459677cd34eee8815aec05342bd30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b07990c-5f32-4582-8bc0-ecfda491f959/365_days_journal_questions.pdfIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_fe33bd6950c447f2af7cd6f2fff4e9ff.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B21 5564 bytes
SHA-256: 38563f8c9707de628d34b40d33e8142275d691af5aff74d200e33402d500edcc
font_01_sfnt_off00013df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF3 11256 bytes
SHA-256: fc1e62cc89563f17de5979e0a829612d06bd4eac62cfda8ca826e67500b64285
font_02_sfnt_off00016433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16433 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3