Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8579d13af459228…

MALICIOUS

PDF

82.3 KB Created: 2021-04-29 23:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3c803b3d51f14bfecb4f002255df894 SHA-1: b20c266c5a3d97a88d883aceeba1d343c6577bf7 SHA-256: e8579d13af459228d9b7fec5b198f2a23850d69040b3198ee667fbe650ab6d32
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. The embedded URLs and the document's apparent purpose of luring users to download content align with a phishing attack.

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://resalured.ru/strik?utm_term=when+breath+becomes+air+pdf+reddit
    • http://italywow.pro/819444939819m0m8.pdf
    • https://cdn.sqhk.co/nejibija/ghGjbBg/smurfs_village_cheats_2019.pdf
    • https://cdn.sqhk.co/givikofuf/kRkheje/96201306526.pdf
    • https://cdn.sqhk.co/vasozaponem/bji1wgd/figiwuwomexisazumoj.pdf
    • http://rineset.xyz/vulusawapatupesoy2buq.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://topmassage.net/journey_to_the_west_full_movie_download_in_tamil_dubbed0l459.pdf
    • http://baltika-trans.com/xoramigotexpi5et.pdf
    • https://cdn.sqhk.co/zezerixuwab/gdhcBhd/gel_nails_done_near_me_georgia.pdf
    • https://cdn.sqhk.co/kivutuzo/uQDheje/36439877142.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_7029d16761584794baf09dd81730b8f3.pdf?index=true
    • https://s3.amazonaws.com/juzowilipi/vojidipedariwedusikux.pdf
    • https://s3.amazonaws.com/purawuma/allocating_a_task_or_duty_codycross_answer.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_3cab2a34e352408aaeeba0bdb1908173.pdf?index=true
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_7fb80931ffb04439bab362f81a463de6.pdf?index=true
    • https://s3.amazonaws.com/xarojapi/shoulder_muscles_anatomy.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/causes_of_aplastic_anemia.pdf
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_2055e319686f424db5fe94d87ed970c9.pdf?index=true
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_aaeceefceb2d4302811d4fb7243f95f4.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_off000102cc.bin
eaba9c4ee5035adbf485c6a33b5c4f1024cf4a76daae9db69d1393ad41e97263		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 5516 bytes
font_01_sfnt_off00011563.bin
1bd9b67ecf53b0e2e536a9f5b32057ec9d380ca412d948dcab434b2f8e732500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 11496 bytes

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