Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4285afc69b59bfa…

MALICIOUS

PDF

67.3 KB Created: 2021-05-25 04:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9bc8dcaa65d8368f75ffd7c95aa219a SHA-1: cf9dee9744f03d699cf31cdd0985618b4b2f74a3 SHA-256: e4285afc69b59bfa6e99a2a56e34bb65567580ba169f6dc74a3d43f15ba3e0f8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=transcription+and+translation+practice+worksheet+answers+pdf
    • https://xonuguzuv.weebly.com/uploads/1/3/1/3/131382030/4432343.pdf
    • https://zilifanaj.weebly.com/uploads/1/3/4/4/134444715/mafowelonokoda.pdf
    • https://cdn-cms.f-static.net/uploads/4477620/normal_6042f4a6dfebc.pdf
    • https://cdn-cms.f-static.net/uploads/4444636/normal_6063f4d18a24e.pdf
    • https://static.s123-cdn-static.com/uploads/4499002/normal_600944414e252.pdf
    • https://cdn-cms.f-static.net/uploads/4416299/normal_606d10b255444.pdf
    • https://niwurakoj.weebly.com/uploads/1/3/4/5/134588258/b6a0b9.pdf
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/6de06.pdf
    • https://cdn-cms.f-static.net/uploads/4385424/normal_605c770f75189.pdf
    • https://static.s123-cdn-static.com/uploads/4472221/normal_5fecd04066aaf.pdf
    • https://cdn-cms.f-static.net/uploads/4465543/normal_601ee71ee87e6.pdf
    • https://cdn-cms.f-static.net/uploads/4377388/normal_604d02f33ac97.pdf
    • https://favipipuwebex.weebly.com/uploads/1/3/5/3/135397367/6a14d746.pdf
    • https://mudizuponiwox.weebly.com/uploads/1/3/2/7/132740987/rowexisijizusiduxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mexesazaxasa/51959358997.pdf
    • https://uploads.strikinglycdn.com/files/7544332b-cfaa-437d-9da8-495de3961af0/reaccion_de_sintesis_ejemplos_formula.pdf
    • https://uploads.strikinglycdn.com/files/156ea9a3-981a-4946-80a2-744375990491/mini_mental_status_examination_slideshare.pdf
    • https://uploads.strikinglycdn.com/files/dfc3a0c9-70d9-4fe5-b75e-be90eba1d1c1/how_to_reduce_belly_fat_in_tamil.pdf
    • https://s3.amazonaws.com/wovugi/batman_a_death_in_the_family_online_sub.pdf
    • https://uploads.strikinglycdn.com/files/abe0c62b-684c-42bf-902a-f40ea2f82c95/how_to_light_up_water_heater.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_off0000c876.bin
7660cfe4cbaeee2967f769f2ce6d2b803eee33c990de2ea07dfd42acc4de9bd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC876 5348 bytes
font_01_sfnt_off0000dab3.bin
2c44edb252eafccba07aeace14923e7d76fbcb6c467febb72f802e61e2e653cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 10136 bytes

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