Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c02559fd0904de…

MALICIOUS

PDF

77.9 KB Created: 2021-09-12 02:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed4ac43c77b4e76bff847875ffc11811 SHA-1: dc0dc22902a5f504293fc2ed5195a49e33f25a10 SHA-256: 57c02559fd0904defbf06f71fabd939b656e0b6589207c16b714a543bbb2d039
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm to distribute phishing or malware. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically identifies this pattern, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://easy2ticket.com/upload/files/zoxabor.pdf
    • https://worldpigment.com/image/upload/File/69816866974.pdf
    • http://recko.ru/ckfinder/userfiles/files/netefisagasa.pdf
    • http://huseyindurmuslar.com/images_upload/files/putojodesemaxipisolule.pdf
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/migovoboredujemod.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/576dc9c8672eccd1958f52305a836aa5/zofolepadok.pdf
    • http://hkwwta.org/userfiles/44750467606.pdf
    • http://efuegypt.org/userfiles/file/29367890109.pdf
    • https://rainbowfurnitures.com/files/files/setitig.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/korojutitipovebiw.pdf
    • https://aiaciran.org/cache/fck_files/file/jedijikofoji.pdf
    • http://sayarbobinaj.com/file/siwulara.pdf
    • http://shijijiaming.cn/filespath/files/20210903233518.pdf
    • http://take114.kr/FileData/ckfinder/files/20210912_92A82CB94CFDCBC5.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/kebazovu.pdf
    • http://thucphamchucnangmy.vn/uploads/files/22562032125.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/aa0561c6a3cade22491c8364739d4c37/7185246113.pdf
    • http://wxmx.cn/upload/ckimg/files/202109120556214577.pdf
    • https://specialgarden.ro/userfiles/file/22071501548.pdf
    • https://benhgout.net/uploads/Files/file/42936581279.pdf
    • http://jjinline.org/file_upload/file/66687810164.pdf
    • http://antifftech.com/uploadfile/file///2021090306041336.pdf
    • http://razaviota.ir/basefile/razaviotair/files/2592101137.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=new+punjabi+songs
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc44.bin
727e7f379745e0add21e856e959a8a037edbb99896e5fc59bd8d01f6ec8ffe48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 10616 bytes
font_01_sfnt_off0000e473.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 16792 bytes
font_02_sfnt_off0000fc85.bin
3917fd0a7f61671da222691cff669aeb0d6b7e8d9af80ed5c97dd5908354c126		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 17728 bytes

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