Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c58aa493baab3b3…

MALICIOUS

PDF

77.2 KB Created: 2021-02-16 19:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2dd846f60619d0d5d31aa58d104e7ef3 SHA-1: 3d78ca01d56436477716de7b8b57437bbb5e44c9 SHA-256: 4c58aa493baab3b374de575f0bbac12ac8cf275903132c8d8fbf051120693943
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/wix?keyword=how+to+dismount+out+of+handstands PDF link annotation
    • https://cdn.sqhk.co/jojojidatun/ge3ZhhU/71503694166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_60148f7a45474.pdfIn PDF document text
    • http://rukunikuxajosog.22web.org/percent_water_in_a_hydrate_lab_report.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/J8VGhcF/lanoxove.pdfIn PDF document text
    • http://nevozepamuj.iblogger.org/6557069586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450501/normal_5fec195e02c9f.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/ggehbx3/anthill_farms_comptche_ridge_pinot_noir_2015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_6020c0b2a9b68.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/ca6971b2b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464524/normal_6016e6273dea6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5fde57eadfb49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_601e2a47c6424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poburukexefisit.rf.gd/algebra_worksheets_year_10.pdfIn PDF document text
    • http://jixenefotudak.epizy.com/32159003049.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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 5072 bytes
SHA-256: d47d6f516b52756e7d59c1b30eb518ee467628d12cd3ae98773dc39f6fb1da8d
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 10328 bytes
SHA-256: 60a2872b3626ee4aedd257d60633f8e41da42f5cdca2433bdb172569bc833960

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