Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3b79fa9dfa6cba…

MALICIOUS

PDF

67.4 KB Created: 2021-04-07 19:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9da300b66d0b135a802de9ac78f8b2e4 SHA-1: 5afd0d92ffa82324b5b9256af0bd5330a6229831 SHA-256: ca3b79fa9dfa6cba67349a891760d54f5647e00f3ba9107ea0a472fd33bac546
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with one prominent URL pointing to 'dugedepap.ru', suggesting a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to manipulate search engine results or direct users to potentially harmful 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://dugedepap.ru/wix?keyword=kotor+scout+guardian+build+reddit
    • https://cdn-cms.f-static.net/uploads/4449405/normal_606a7dd55a28a.pdf
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5fe970e7027f1.pdf
    • https://cdn-cms.f-static.net/uploads/4368969/normal_604a76f5a651c.pdf
    • https://cdn.sqhk.co/wowedofu/ejjgdhA/32591115147.pdf
    • https://jamobosis.weebly.com/uploads/1/3/4/6/134684796/voxogekeserodu.pdf
    • https://cdn.sqhk.co/jogepirar/hbtTIwz/master_bow_super_stickman_archero_fight.pdf
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/fejen.pdf
    • https://cdn.sqhk.co/sarunasol/ZJszhcO/reduce_alchemy_time_bdo.pdf
    • https://cdn.sqhk.co/furigelo/iezijAI/boxejunozanar.pdf
    • https://lebilelumebik.weebly.com/uploads/1/3/1/6/131636833/4f4b776b6ad6ca.pdf
    • https://tokegomobox.weebly.com/uploads/1/3/4/3/134314144/8758284.pdf
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/1ca873e00f0b4f7.pdf
    • https://static.s123-cdn-static.com/uploads/4490757/normal_5ffca0b72c548.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bd6bed0e-721b-4175-a870-88a5a96c3f24/how_to_clean_the_uppababy_mesa_car_seat.pdf
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_17fbdb8d3e2b4b1ab470c57692fc18c7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/05db1509-318b-4b89-87d1-71a7c04a878d/vimifuvuxugam.pdf
    • https://uploads.strikinglycdn.com/files/e60bacad-f3f6-4509-9ccf-0c93bd82804d/the_forgotten_ways_alan_hirsch.pdf
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_023b7880848b49ec86c2338340e1d294.pdf?index=true
    • https://uploads.strikinglycdn.com/files/914d0dd5-d6d4-4cfb-b52f-0eb1c0d33e4e/samsung_dishwasher_dw80j3020us_wont_turn_off.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_off0000c9f1.bin
11166ce4749580a579797f74966254ba6fb2d4a7526ce8dc49766fa09d1afa35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F1 5216 bytes
font_01_sfnt_off0000dbbf.bin
7397c9849873ba4644115ff40f5c81e05c1e232a10a8e2ca15fdaf04e43f30ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 11396 bytes

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