Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c71003aef1811f…

MALICIOUS

PDF

74.2 KB Created: 2021-05-19 02:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e15793329c55671ce308331dbc551328 SHA-1: 02bdc1d139b732a17dbba66c1b557f0d40d18527 SHA-256: c7c71003aef1811f79bbaefa424581e0db0d7e57d9d6d4c2ec7f58f8add9c078
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a link farm of disposable URLs, with one prominent URL leading to a potential second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded links suggest it is designed to trick users into downloading malware, likely through a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=should+i+download+high+sierra+on+my+mac
    • https://befapoge.weebly.com/uploads/1/3/1/6/131637854/7290950.pdf
    • https://liberiloro.weebly.com/uploads/1/3/4/5/134589576/pizareputowipak-viratapabos-diloxazuga.pdf
    • https://negowisavu.weebly.com/uploads/1/3/1/4/131406226/kojogivitup-dujemus-selijubagas-bixoli.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/3445610.pdf
    • https://fenolipemul.weebly.com/uploads/1/3/4/3/134341818/zewikuwine_funirovap_zijoziga_pegelenitagow.pdf
    • http://riwejurefuwubep.iblogger.org/how_to_reset_ink_pad_epson_l360.pdf
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/risoriwon.pdf
    • https://libizewixowu.weebly.com/uploads/1/3/4/4/134432873/4951329.pdf
    • https://vipapesad.weebly.com/uploads/1/3/4/3/134369303/8483094.pdf
    • http://damodudajipofem.22web.org/xezonapomurikozexug.pdf
    • https://juzopuxenepin.weebly.com/uploads/1/3/5/3/135383483/e7146f3974adf.pdf
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/0b9dbcbf.pdf
    • https://gegizadewer.weebly.com/uploads/1/3/1/4/131482997/606c0df06af1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sozizuw.rf.gd/al_quran_karim.pdf
    • http://naxiwagozidixi.epizy.com/navajiwuna.pdf
    • https://s3.amazonaws.com/jirebonudur/how_to_workout_the_gluteus_maximus.pdf
    • https://s3.amazonaws.com/fifomi/happy_birthday_sheet_music_g_major.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_off0000e4ec.bin
0597d6bf3c3ee367108ee5069eb914cd818e1fd6547b69a32e30116f9efcf4b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 5648 bytes
font_01_sfnt_off0000f816.bin
41884d753b929362e78c133cc04db29d792a99a5d5cb78d1ce3eae56423f6111		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 10564 bytes

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