Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddb771dcfdf0d31…

MALICIOUS

PDF

77.9 KB Created: 2021-06-09 03:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a0a51ba493293a96ab60c841a367fc6f SHA-1: 146c251d24d1ca9c034ccf8b985d41bad7d3593a SHA-256: dddb771dcfdf0d31522edc7f54ddee522148caf55e8b2a4ffdccf7cb0e3c85f5
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of a 'download button' heuristic further supports a malicious intent to trick the user into clicking a link. No scripts were extracted, but the PDF structure and link farm indicate a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/pbw?utm_term=pokemon+uranium+gba+rom PDF link annotation
    • https://tujemodi.weebly.com/uploads/1/3/5/3/135301643/5400507.pdfIn PDF document text
    • https://kapadarobuziwel.weebly.com/uploads/1/3/2/6/132696145/motawijo_puraregobafelew_jizupasopegovit.pdfIn PDF document text
    • https://natedutaz.weebly.com/uploads/1/3/4/8/134850225/bolonujeputoditomebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_601eb138dc772.pdfIn PDF document text
    • https://ramaxuvezida.weebly.com/uploads/1/3/4/3/134327775/7910585.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/d4f6f2d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_60396d4818144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_60484c7b53ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446015/normal_605d662cee764.pdfIn PDF document text
    • https://tumonejaw.weebly.com/uploads/1/3/6/0/136086042/5c2e931acfdbf4.pdfIn PDF document text
    • https://lasajazog.weebly.com/uploads/1/3/4/8/134885140/f110b050274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_6013cd600eeee.pdfIn PDF document text
    • https://jivafizet.weebly.com/uploads/1/3/4/7/134743279/rajasisezoviveg.pdfIn PDF document text
    • https://kerozusokenizil.weebly.com/uploads/1/3/1/3/131383247/xetetiwelujakuk.pdfIn PDF document text
    • https://nubajegi.weebly.com/uploads/1/3/0/8/130814178/89e82b3f7ae68b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5ff4727a22a02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144510111/pedigree_analysis_212_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4792872b-99a9-45b1-9e42-260a73a95230/will_there_be_a_miss_peregrine_2_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/459d6243-f367-4039-8411-3523a28ed354/which_programming_language_is_used_in_kali_linux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2bfbce-3f6c-4d1d-b287-7a87b8be6476/sozazaraxozapuzaluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59529fd9-deb5-49df-96d7-02f826b6510e/ninja_foodi_cold_and_hot_blender_costco.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/edgenuity_english_4_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59436fc2-27de-4c40-9b17-a544269272b5/love_in_the_time_of_cholera_quotes_with_page_numbers.pdfIn PDF document text
    • http://pitevaj.pbworks.com/w/file/fetch/144896286/vanguard_zero_deck_code.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144699255/be_our_guest_book_download.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_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 5000 bytes
SHA-256: 35af750398c7693381212245b16864276230d5ab2d6594e20052d41aa0f3d617
font_01_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 11128 bytes
SHA-256: ae8110f63570d5b49f8e57ff154cd5ed48b3857a0a78753cbeb36c11473f383b