Malicious PDF — malware analysis report

Static analysis result for SHA-256 825dc7e00b83eb74…

MALICIOUS

PDF

80.0 KB Created: 2021-04-05 23:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbffce3e37ecd1c79288291c8a13772a SHA-1: 9216fd459eae2217d552535c0cbc1e6588a4e5f8 SHA-256: 825dc7e00b83eb74586a4b3c1ae2b434ea7ef22a2e0b7405f55aea2d75b38279
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to "Tamilrockers love feeling video songs" and authoring application details, likely serving as a lure to drive traffic to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://dafemum.ru/123?utm_term=tamilrockers+love+feeling+video+songs
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/zekogur.pdf
    • https://cdn-cms.f-static.net/uploads/4419236/normal_6044a030c2922.pdf
    • http://sofebitaxed.iblogger.org/daruju.pdf
    • https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/8003257.pdf
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/giwaxupamezid-fukibewuzatudi.pdf
    • https://static.s123-cdn-static.com/uploads/4368493/normal_5fca6d92e02b1.pdf
    • https://cdn-cms.f-static.net/uploads/4427501/normal_605f76b19a744.pdf
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/2ed950a708.pdf
    • https://vabinori.weebly.com/uploads/1/3/4/3/134348027/3ef3a5a11808e88.pdf
    • http://matenodol.22web.org/visoposomevawebepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f766a7e9-a0d0-4e3a-bf7c-946d2e8c2ff4.filesusr.com/ugd/bddb96_f08a6448bfa144459531f282163f6a22.pdf?index=true
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_f6d675348fdb40a18dfa356f60c79c17.pdf?index=true
    • https://s3.amazonaws.com/rimepusox/bloomberg_terminal_data.pdf
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_03d80db387db432b8ee5488129550cda.pdf?index=true
    • http://gupufodoluvasa.rf.gd/zoxagugeguzazisonanemupij.pdf
    • https://s3.amazonaws.com/xijalovelokolep/65560253209.pdf
    • https://s3.amazonaws.com/xumakomowi/bootstrap_website_templates_free_for_php.pdf
    • https://s3.amazonaws.com/verirejon/93670797976.pdf
    • http://lefigop.rf.gd/color_by_number_christmas.pdf
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_e41df24c94b64497ab455dca34eb70a1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3c.bin
3b98c3b7e9536388a2dcb59472b9c499bf96469ef3d315f3011a20698a4818e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 5124 bytes
font_01_sfnt_off0000fd8b.bin
0cf2318951ea25354d3e2b2aa2329b28766db55d9d3a7e8c60e7fe9320fb94e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 11604 bytes
font_02_sfnt_off0001249a.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 4324 bytes

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