Malicious PDF — malware analysis report

Static analysis result for SHA-256 048ba4c835d68dfe…

MALICIOUS

PDF

72.3 KB Created: 2021-04-21 04:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3b5b769498379ac48dea03103d0798ca SHA-1: f112e965b80763cb6226e62b0031e95c131e4c3b SHA-256: 048ba4c835d68dfeb69ae7631d95bf9935fe19975b51aa3f65cff571593403d6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external link farm are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=ariens+8526+parts+manual PDF link annotation
    • https://cdn.sqhk.co/wuwoxegolewa/jdphghi/chinese_kung_fu_meditation_music.pdfIn PDF document text
    • http://priz24.site/pak_studies_9th_class_book_in_english9vjfe.pdfIn PDF document text
    • https://cdn.sqhk.co/lifudidu/hc6hfie/bitewemuj.pdfIn PDF document text
    • http://chempion.coffee/speed_distance_time_worksheetsq6v3i.pdfIn PDF document text
    • https://cdn.sqhk.co/xomorenut/hWgigf1/racing_war_games_ps4_vs_xbox_one.pdfIn PDF document text
    • http://circulyarkadigital.xyz/iamotus_bluetooth_drivervjuha.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/toro_personal_pace_mower_maintenance6uffq.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/8gdTge6/vikamojazunufijujeviv.pdfIn PDF document text
    • https://cdn.sqhk.co/suzironanes/kGid8E5/4149251560.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/943a6434-417e-4220-965e-08152592422e/kuzunobogugojutebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b5ff28-b8a3-418e-8d95-0dde1b012966/how_to_learn_fingerstyle_guitar_fast.pdfIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_446494371339478ca278790060bf6e45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ca0c95-0a78-4a8e-9be3-25d398781224/in_the_heat_of_the_night_book_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490e22b1-b0d0-4a32-8547-68f137b7ae71/who_are_some_famous_greek_artists.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca4b590-b848-43c6-b612-587c7e897966/85128986530.pdfIn PDF document text
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_bcefea8137704540a236bb0e28d39e83.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a825c685-b456-4fc9-8143-e90a097b313c/kuwezuzapegubifozuru.pdfIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_61c8a946bb634e95b38c568e25e22dae.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_a06089f5a7c84200bc68b3d6d136fc2a.pdf?index=trueIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_7ee6463320b64d3d8f9a9a06eaca1c79.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 5560 bytes
SHA-256: dccef2b4777ec43e1ee721db1602e6ab9e4c5db33ed88f4f08404f03563e8909
font_01_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 11056 bytes
SHA-256: abe93fc1028ecfb6c0c2c2397313493904ba9dc7a311aeaa0bc4f5bfce78c667