Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b68329146b79719…

MALICIOUS

PDF

82.1 KB Created: 2021-05-03 17:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4c493135fed949d79e0ec65d794aac44 SHA-1: 0e5cb6a064d94eb137f74649147845b213331cc5 SHA-256: 8b68329146b79719aca32ab8e3358ae5adfcd09cc05691ac9c334031a293e286
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards a common tactic of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=are+manhattan+prep+gmat+tests+harder PDF link annotation
    • http://pl50off.info/farmer_boy_laura_ingalls_wilder_audiobook5ha6s.pdfIn PDF document text
    • http://torchland.xyz/749117775631qj4d.pdfIn PDF document text
    • http://nozumupi.medianewsonline.com/hanuman_chalisa_telugu_lyrics_in_english.pdfIn PDF document text
    • http://life50it.pro/figiz7ew0y.pdfIn PDF document text
    • http://podeves.xyz/30670069362f51vx.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/71c622bb-5981-40db-8524-b3c6e64bf330/40350062623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8184b222-88a3-43e6-9cff-4d9963167770/97940572156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aad6e2a-7c10-4451-8fd4-8ff753ddfd66/wazuwududesefopolaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc1bae8-28c2-4317-9d9f-9941aa5c09c6/is_there_a_crossfire_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2786f5b5-23bf-4e67-b5b8-59ce961133d0/how_much_do_private_dog_training_lessons_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5904c4ff-8a27-4063-b7a5-9e421e32d43d/94090350098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9407b4-02ff-4c20-9012-f78a103b8c95/how_to_use_construct_3_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b786d124-5184-48e0-acde-fd92bf52cf46/bunapisozivovafoxez.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/sistema_endocrino_y_su_funcionamiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a59a116-270a-4696-ab14-c8cb42e7d483/design_as_art_bruno_munari_review.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/adobe_illustrator_reduce_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98fe03d7-d945-49dc-8379-e9d0854695c5/porunivepoxonotitekagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e576e66f-c215-41d3-8377-a664243644fa/how_much_oil_does_a_2015_ford_explorer_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3fbcf8b-e858-4f75-a6e3-bf684967fcb7/26657958608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f02301-3d3c-4692-aa3f-7aee08378af0/conflict_management_examples_at_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5497bee3-9bb5-4d24-ac1b-58b81eeb6116/what_is_central_and_peripheral_cyanosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30245ceb-ebf9-481e-bf21-fb0fec36c646/64701126365.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/afghan_embassy_london_passport_form.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_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 5332 bytes
SHA-256: 6605279af638a64a4283e3132cbeee54bd52a9f69206a8ed66caa2ee511d2492
font_01_sfnt_off000114e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E3 11108 bytes
SHA-256: 3a225da323889e08154507650c42fc148bbee6762a7625cbf6fbd435a950c4eb