Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab030d7eb816ac5…

MALICIOUS

PDF

78.6 KB Created: 2021-02-18 00:37:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 70fa59841cf9a61161139bb85a13a52e SHA-1: feca79d713737df224599b0ae4f8da7500367bc4 SHA-256: aab030d7eb816ac5649f1c14c5dc2f0dd57765e15a080e38636f0e675752af30
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a URL associated with a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://seumenha.ru/wix?keyword=makita+table+saw+model+2708 PDF link annotation
    • http://kigajekuterol.iblogger.org/73954726462.pdfIn PDF document text
    • http://kizijele.iblogger.org/15497510024.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/W6WhfC4/maxis_match_cc_folder_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460686/normal_5ffc825193780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419003/normal_5fea1791a8f3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kotidaw.epizy.com/letterhead_design_cdr_file_free.pdfIn PDF document text
    • http://vokunewegulu.epizy.com/nosezofakezoxo.pdfIn PDF document text
    • http://zelekisiwamab.rf.gd/mumomagotuwepev.pdfIn PDF document text
    • http://jeruzofifisamen.rf.gd/reported_speech_with_gerund_bi_tp.pdfIn PDF document text
    • http://dusetelonuzaj.epizy.com/88403827270.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_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 5724 bytes
SHA-256: 64387c56f84b4a74333a21a086cca95b6c8984268667f0906c2fc2c8b58c9abb
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 10844 bytes
SHA-256: 615622fd7217dffb4fe020836f24355d3a49ec1d96718609285ff640757ed5d7

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