Malicious PDF — malware analysis report

Static analysis result for SHA-256 58130dbf80511a7a…

MALICIOUS

PDF

77.7 KB Created: 2021-03-17 02:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bc15674d7e28a5d6cb7cbb70d4d5c2dd SHA-1: 6842ea806639939042d5ed67317a3cb9e9f8d271 SHA-256: 58130dbf80511a7a519c64e190ca64a88f2ddf9d593060f0ba2f51295af545e4
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ponafet.ru/strik?utm_term=does+a+nest+thermostat+work+with+alexa PDF link annotation
    • https://cdn.sqhk.co/pimidima/zqihjf5/motoxos.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/djdbOgf/restaurant_story_2_game_cheats.pdfIn PDF document text
    • http://groshyk.site/what_kind_of_oil_does_a_2020_chrysler_pacifica_takeygcg6.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/6Qjifhb/basketball_hidden_balls.pdfIn PDF document text
    • https://cdn.sqhk.co/zozotetowa/fhjPjeD/61162534633.pdfIn PDF document text
    • http://wimisumuvov.iblogger.org/examples_of_quadratic_functions_in_vertex_form.pdfIn PDF document text
    • https://fademorojotuk.weebly.com/uploads/1/3/1/3/131379253/pepuxamolezewol.pdfIn PDF document text
    • http://hookup756.fun/pofamimegunozivazanu59a0.pdfIn PDF document text
    • https://cdn.sqhk.co/tijatabov/8ja5QH1/kezeta.pdfIn PDF document text
    • https://dorenezawux.weebly.com/uploads/1/3/5/3/135383086/xorofosibijomiv.pdfIn PDF document text
    • https://dekajemo.weebly.com/uploads/1/3/1/4/131453049/c6224dad5566.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/3170546.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/posufij/biropasebafotew.pdfIn PDF document text
    • http://datasixiva.epizy.com/coreldraw_x4_portable_gratis.pdfIn PDF document text
    • http://netomaniw.rf.gd/luwomorepimezazupuwewi.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/76100673537.pdfIn PDF document text
    • http://xojakejib.epizy.com/c_difficile_canadian_guidelines.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 4936 bytes
SHA-256: e728e00d21a6bf4432d3f0ef70d59358697732a117e8618fed0f620f5d87d5dd
font_01_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 10800 bytes
SHA-256: 9e2bb05cb52154496837f49f35d34794cc6760bc73403892ccd554b499d491ba
font_02_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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