Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c29b8ce84197af1…

MALICIOUS

PDF

74.4 KB Created: 2021-06-09 22:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 628beba016fb7f880a8f2cc568790970 SHA-1: 11beb36d20df37f63f6cd79c9fb413150b4c39aa SHA-256: 3c29b8ce84197af1ffcef029902647e98ed7e3d96c2dd70778d2337846a6650d
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The primary URL, 'https://inwebjor.ru/pbw?utm_term=my+demons+song+download+mp3', suggests a lure for downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://inwebjor.ru/pbw?utm_term=my+demons+song+download+mp3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421048/normal_5fd09ec3f0259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420587/normal_5ffdf1cf5d805.pdfIn PDF document text
    • https://wubepina.weebly.com/uploads/1/3/4/7/134721378/3101f151011baf5.pdfIn PDF document text
    • https://zinelenugep.weebly.com/uploads/1/3/1/6/131636957/kuzepokusikalixujiw.pdfIn PDF document text
    • https://dafalozurevibi.weebly.com/uploads/1/3/4/3/134308304/4738273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496597/normal_60657a719fe6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_601e4ac31df2b.pdfIn PDF document text
    • https://sopulekazixov.weebly.com/uploads/1/3/0/7/130776801/fenus_fapuxif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_606285b38a4d7.pdfIn PDF document text
    • https://dibugovag.weebly.com/uploads/1/3/4/7/134710264/835975.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1d8724d-253f-440a-aeba-f03dec2afad3/71102742421.pdfIn PDF document text
    • http://vulazojab.pbworks.com/f/tatediwenopiwibopemukomam.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/reading_plus_level_k_answers_silver_wings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3935ac0-2be4-407b-a96d-0ca40434f15c/good_drills_to_improve_ball_handling.pdfIn PDF document text
    • http://ragasegena.pbworks.com/w/file/fetch/144640632/do_amtrak_trains_have_dining_cars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8b47ac-71a2-4cf4-9594-5259d8596dc6/android_9_1_huawei_mate_9_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897ceea0-f526-4867-bfd6-d36a27675c0e/72745045747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f516720d-7d71-4482-9c36-9bc8a10fe07e/14371687090.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/lewinozuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb30ad8-1d55-494f-ad3c-3dc6a212d0b0/resolirofej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a08294-14bb-4f9e-adb7-981d54235fed/what_are_the_most_secure_bike_locks.pdfIn PDF document text
    • http://kosumepifise.pbworks.com/f/michael_tellinger_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852e3d41-7f56-4b02-b970-00fb4eff1e41/1776846282.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 5548 bytes
SHA-256: 69b1dbd617353fa4d7f086d72d81d818f413c26b935c8079b1681048d2a05d2d
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 10696 bytes
SHA-256: 2f66ed7104cb61646c004a7ffcf392694d225059f8db7dbd72a743845bcf7a18