Malicious PDF — malware analysis report

Static analysis result for SHA-256 affb5b703a63ba7c…

MALICIOUS

PDF

75.4 KB Created: 2021-01-23 07:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 41d952f6faf21cc94ac6f828afe8a58a SHA-1: ee1c0e232634ec3ef4d597e55ea7bbe0bb63cdc7 SHA-256: affb5b703a63ba7ca249e8c452468fd4a61e8ca303ce90464433cc81e64b8635
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=bar+stool+autocad+block+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462065/normal_5ff864a343e74.pdfIn PDF document text
    • https://noperutepa.weebly.com/uploads/1/3/4/7/134721309/wutiramu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_5fd27ca469cf4.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/rawuzasixixe.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxumududu/bFjg8hj/68078163952.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/jg8S4Gt/xirasala.pdfIn PDF document text
    • https://site-1172119.mozfiles.com/files/1172119/bimaxudad.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuwitide/cibgi4i/53921275484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418584/normal_5fe67296254ba.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/fKWlieB/pukigekubulikexenu.pdfIn PDF document text
    • https://site-1197505.mozfiles.com/files/1197505/ladun.pdfIn PDF document text
    • https://site-1197512.mozfiles.com/files/1197512/annexure_a_mvat_in_word_format.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/yhdhbUk/sandwich_grill_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jazupizewatabal.epizy.com/759546098.pdfIn PDF document text
    • http://jibogifimot.epizy.com/new_gems_english_reader_class_6_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/64282628073.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/gunikepi.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/can_u_use_apple_airpods_with_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/apk_blibli_versi_lama.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_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 5268 bytes
SHA-256: b2ae2bedf23407b1318a1182a76cfb10ef48108658260fd41a7e5329aac22fd1
font_01_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 11512 bytes
SHA-256: 277df255e7de95bd1f012f98a761a548cf6beecdf798ddcab6d2bc7dae8e8b78

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