Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89ceab3282962ea…

MALICIOUS

PDF

69.2 KB Created: 2021-02-22 02:14:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 28ac1cdbfb5e8db7284567a848d4ed19 SHA-1: 78bfeef27a4b3fecef559f47f2599102c1eab6fc SHA-256: f89ceab3282962ea31680ae2fcf2b9d0829c65553e351e9cbe182c9781fc777b
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, and contains numerous links to external PDF files, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at `https://crophysi.ru/strik?utm_term=the+cannabis+encyclopedia+audiobook`. The document body, though heavily obfuscated, contains references to 'audiobook' and 'wkhtmltopdf', indicating a potential lure. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=the+cannabis+encyclopedia+audiobook In PDF document text
    • https://static.s123-cdn-static.com/uploads/4393485/normal_5fc9caf38f69b.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/h1Otii1/buwajet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_60090b54ca48b.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/ajjLghN/68517404282.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/hghgcie/wivobakikim.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/gjbgerY/60710140456.pdfIn PDF document text
    • https://tiwudusakuwizir.weebly.com/uploads/1/3/1/6/131637104/mulazafab-runokazofoxit-divuzisowo.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/Z3AMid7/strikers_1945_ww_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/fZjjFhj/switzerland_coronavirus_travel_from_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/fivodilo.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/funny_news_reports_scripts.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/pubavikazofupobef.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/mujupefifeju.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/43956089386.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/88800170301.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/12257393692.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_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 5320 bytes
SHA-256: a8a56c4410d312344e1e8f9e2171106650b54e7139cd8e02d469680d273aab0f
font_01_sfnt_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 11292 bytes
SHA-256: 41d842ad4739e1c511e97cb003e3d849d06562df2dedefeb5f1c84edb73ecabd

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