Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0dda3787a8136a…

MALICIOUS

PDF

74.8 KB Created: 2021-03-20 08:29:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d84bbfdd4b2712bcb76370a44a074583 SHA-1: 5e53c219e13c48236f582f9c93b69bceddad6ec5 SHA-256: cd0dda3787a8136a7438a5ba9d35ddb4d8af046ad37066dfd584cc5032b74054
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious content. One of the primary external links points to a URL that appears to be a lure for a common technical problem.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=my+troy+bilt+won%2527t+start
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/gikofufijoniden_fupolo_fuxom_riwef.pdf
    • http://beritox.medianewsonline.com/hirayama_autoclave_hv_110.pdf
    • https://static.s123-cdn-static.com/uploads/4388062/normal_6000566b78780.pdf
    • http://onlineeshop24.xyz/dion_the_wanderer_lyrics_traduction23r72.pdf
    • http://nebuxopav.mypressonline.com/32347094817.pdf
    • http://novonet.online/how_to_wear_baby_forward_facing_in_ergo_360gozhl.pdf
    • http://wijofotezopadik.medianewsonline.com/bls_algorithm.pdf
    • http://italysummer.fun/technical_drawing_basicsn7wtm.pdf
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/4532329.pdf
    • https://cdn-cms.f-static.net/uploads/4500895/normal_60390cc5be446.pdf
    • https://cdn-cms.f-static.net/uploads/4501045/normal_5fd10c54db324.pdf
    • http://relibafogat.sportsontheweb.net/business_plan_notes.pdf
    • https://cdn-cms.f-static.net/uploads/4493881/normal_602de82c9d161.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_f90b0aa2633547d98bda5325902ecaaa.pdf?index=true
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_4e9ee69e892846e68d28eac58ab3adac.pdf?index=true
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_3721edac6665403c8389b9a14b41fd62.pdf?index=true
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_b7587e63a29649cd97ba7703e911eb8c.pdf?index=true
    • https://s3.amazonaws.com/fizaxo/35167680944.pdf
    • https://s3.amazonaws.com/labitajaxatufib/pandoc_markdown_to_code_block.pdf
    • http://pidusagi.atwebpages.com/activated_carbon_market.pdf
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_6c74999cf2c04703b0138e2e71e6373b.pdf?index=true
    • https://s3.amazonaws.com/dozore/dowilibubejugoluvi.pdf
    • 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_off0000e97d.bin
ee937b388c17189a5cc03301b0771cef69b37d07f75041b31d2ef7fcafbc0b7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 5052 bytes
font_01_sfnt_off0000fae0.bin
e008719879fb17e28737310f6ecfad1c1d3375abd352d9d45d1a0ce336e6d438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 10260 bytes

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