Malicious PDF — malware analysis report

Static analysis result for SHA-256 8628491a232bde04…

MALICIOUS

PDF

76.9 KB Created: 2021-03-01 09:33:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8107c45cc3390cae86d50581e2ad0ac8 SHA-1: f0210deef4896d159d7e5bc6b43949a53681f163 SHA-256: 8628491a232bde04877bf3e0d56f412c81eb023c7b29df98a02b64e0acd8f3d7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body text, though partially corrupted, suggests a lure related to finding software serial numbers, which is a common tactic for distributing pirated software or leading to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=find+adobe+acrobat+pro+2017+serial+number PDF link annotation
    • https://cdn.sqhk.co/xinulezebi/rgeiiib/dixie_d_amelio_famous_song.pdfIn PDF document text
    • http://talefipevaxexe.22web.org/how_do_you_change_the_font_size_on_a_brother_p_touch.pdfIn PDF document text
    • https://bovatukal.weebly.com/uploads/1/3/0/7/130739183/zubijutudituxowop.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/hgdhbNZ/dr_lowe_stockbridge_ga.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/kMjgeju/xerosedixob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_6031e8f3b4ca8.pdfIn PDF document text
    • https://vanufutalolu.weebly.com/uploads/1/3/1/1/131164160/364085.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/ahfzjaV/xofujodumatazapu.pdfIn PDF document text
    • http://jitokinut.iblogger.org/fepilobilavex.pdfIn PDF document text
    • https://cdn.sqhk.co/liweruruzed/kjjhaPe/50010241759.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/3625782.pdfIn PDF document text
    • https://gevobudijopu.weebly.com/uploads/1/3/4/8/134880408/ketowoko-susipepir-gufabojog-rusazaxidaw.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/pipotupaxowirijanot.pdfIn PDF document text
    • https://vevusivo.weebly.com/uploads/1/3/0/8/130874001/fapajadosenik_sizunosi_lavifumo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vefugiw.epizy.com/does_procreate_cost_money_on_ipad.pdfIn PDF document text
    • http://jijazofar.rf.gd/83978291623.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 5720 bytes
SHA-256: 9abeb36cd6ee251f0bbd23549d50530cd0eacc445d70c81ec32992a700c552c4
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 16032 bytes
SHA-256: 44d679c6c0b5b812751e950d20b36c58bb17504c7ce4dd4733b0ac28fd20645f

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