Malicious PDF — malware analysis report

Static analysis result for SHA-256 66924038fd7b05fb…

MALICIOUS

PDF

75.2 KB Created: 2021-05-13 14:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9693368086242495d0f858433a7f138 SHA-1: 2eff016ddc65995bcc14d7a07f9ae608f062f706 SHA-256: 66924038fd7b05fbc3a1d203d5200e86ccea44fbcde336df816118d75ed7239b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=types+of+health+and+safety+risks+in+the+workplace
    • http://ninotekega.mygamesonline.org/89669594321.pdf
    • http://mif-smeh.space/kinepuniwidgfng.pdf
    • http://jinobuzid.scienceontheweb.net/bamajawurevudafo.pdf
    • http://expressday.online/cognitive_behavioral_therapy_worksheetsq8ov5.pdf
    • http://usechambre.xyz/what_are_prime_numbers_between_1_to_10000lszio.pdf
    • http://pifofobexaxel.mypressonline.com/epson_stylus_nx230_ink_walmart.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_35ca9916246e41d395417ea963857e95.pdf?index=true
    • https://s3.amazonaws.com/supefujoxopubu/wituraneluwalakeluwuwu.pdf
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_31149341dfbe4c0f8e8b429a9bfea5c0.pdf?index=true
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_2fca797d08104078ad8244106e4ef760.pdf?index=true
    • https://s3.amazonaws.com/bomupi/solution_manual_of_solid_state_physics_by_charles_kittel.pdf
    • https://uploads.strikinglycdn.com/files/5975869f-27e3-48d6-b1a2-a8dee266fb79/causal_comparative_research_design_purpose.pdf
    • http://sufixis.myartsonline.com/arthur_schopenhauer_the_world_as_will_and_representation.pdf
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_494b17ce9f424d42b71fa1aa393e5cb5.pdf?index=true
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_378c1901f26d4a34b11ee2e7a2eb088b.pdf?index=true
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_706053c4dcb3489eab8084b6a868eb63.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43d262b0-321f-4216-a0cc-d316182cf17b/sikipobuzotuvizuv.pdf
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_e3c43453254045b680f7af5a30f32680.pdf?index=true
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_99d0e0e4e7624c4c82eb23e51a8c724f.pdf?index=true
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_977f32ffe42a41f1bede41748187d07b.pdf?index=true
    • http://mekasesajiw.onlinewebshop.net/6656007294.pdf
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_d86da8629fea4538a6510670cffe417e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e736.bin
6d0743eadeeb4352e76c5483784efe32f639365c22b2fbacb2e5e1ffa37d52a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 5452 bytes
font_01_sfnt_off0000f9d2.bin
eebaedc04ca8aea2c4855d5932e715017626d21e810469bc10280b9fba6b4cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 10876 bytes

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