Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf0fecb8cbc8d53…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 17:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e3d26b6c6b6d824c1776eac89973b12 SHA-1: 40cacf26133edb121f964b1630be9d622a1f0e66 SHA-256: ccf0fecb8cbc8d530ed39dcb71376f035813775c89360cb676bc887d64e9d93d
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 are generated SEO-style links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/award?keyword=articulacion+atlantoaxoidea+pdf
    • https://cdn.sqhk.co/jokawefezo/Jxje249/josegokenunilapakulovus.pdf
    • https://cdn-cms.f-static.net/uploads/4424996/normal_5fdc487f83a65.pdf
    • https://cdn.sqhk.co/kekotenonaxu/cihhfgj/maze_runner_2018_movie_download.pdf
    • https://cdn.sqhk.co/jisokemefaz/kgjfeTC/nimuvipokexelimamibu.pdf
    • https://static.s123-cdn-static.com/uploads/4426957/normal_5fcf34d74c6a6.pdf
    • https://cdn-cms.f-static.net/uploads/4379982/normal_60123259ccdda.pdf
    • https://cdn.sqhk.co/tubawonidas/cHjcAr3/belugipaduvatus.pdf
    • https://cdn.sqhk.co/xuxawexa/bjeTgeh/given_anime_wikipedia_italia.pdf
    • http://xuduzovakuwej.22web.org/55160147767.pdf
    • https://cdn.sqhk.co/sufajezugi/nOhdjdW/autocad_not_visible.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nerokigonone.rf.gd/teviwik.pdf
    • http://dizerexipit.rf.gd/inteligencia_artificial_definicion.pdf
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_c5470d2b94614f33a866a9fd472ed79d.pdf?index=true
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_a3c5ad91b06842028d5d9b61b9240f0b.pdf?index=true
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_2afbcb563f114e5bac7bec3c86c35094.pdf?index=true
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_7681b57a8e714320addb174e00bc6baf.pdf?index=true
    • https://s3.amazonaws.com/ropidadegaxut/92282832605.pdf
    • https://s3.amazonaws.com/kuboki/86355802526.pdf
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_2ba26d12c8604d47a27ecc5d2224b741.pdf?index=true
    • http://nazifaba.rf.gd/amharic_english_parallel_bible.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_off0000ebb1.bin
9123545ed6be402f25917873ebf71f2f67b1882f0ca312ff49fef43df96fb699		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 5028 bytes
font_01_sfnt_off0000fce4.bin
761739e78f94c9a3283bbf3274583f3d1161633289aecbb04bd2d4055fa94c4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 11668 bytes

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