Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9e0eae3dfa3e8e…

MALICIOUS

PDF

70.3 KB Created: 2021-02-17 14:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 101a9640002fc586e92bd86cf1f04ecb SHA-1: 8c27b2adfb69c72bca88c6c7ad3fcb963d8feccc SHA-256: bc9e0eae3dfa3e8e1e55a470c0ab545d355fcafdff1fdfe82af94a5b5f2279c7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to distribute malware or conduct phishing. The document body, though heavily obfuscated, contains a title related to 'working memory skills' which is likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=how+to+improve+working+memory+skills PDF link annotation
    • http://alexsaf.ru/brahmacharya_in_krishna_consciousness1kuss.pdfIn PDF document text
    • http://lamomusexosefe.66ghz.com/lefelaxefaj.pdfIn PDF document text
    • http://tonadep.22web.org/russia_gopak_violin_sheet_music.pdfIn PDF document text
    • https://dogopakuva.weebly.com/uploads/1/3/4/6/134698139/9167283.pdfIn PDF document text
    • http://cardio-natural.info/code_of_conduct_small_business_templategbqyn.pdfIn PDF document text
    • https://lepifokofufup.weebly.com/uploads/1/3/4/0/134018260/tasumasarativu.pdfIn PDF document text
    • https://vanazufir.weebly.com/uploads/1/3/2/7/132740694/1006336.pdfIn PDF document text
    • https://rinavupitaf.weebly.com/uploads/1/3/1/1/131164375/31469db36622.pdfIn PDF document text
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/sakonamevifufixisada.pdfIn PDF document text
    • http://fesigemujelepir.66ghz.com/stanley_trumpet_voluntary.pdfIn PDF document text
    • https://dejoputaxili.weebly.com/uploads/1/3/4/7/134763817/jadekifuvuteropivize.pdfIn PDF document text
    • http://zefabafiw.22web.org/22583347878.pdfIn PDF document text
    • https://xepapure.weebly.com/uploads/1/3/4/3/134367208/6727277.pdfIn PDF document text
    • http://kinoogf.space/the_impossible_quiz_book_2_answers1dcw4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepevalir.rf.gd/absceso_definicion.pdfIn PDF document text
    • http://favukimasinete.rf.gd/maa_tujhe_salaam_song_ar_rahman.pdfIn PDF document text
    • http://jaxovisujopav.rf.gd/all_color_image.pdfIn PDF document text
    • http://bolutiso.epizy.com/tevininabebozopox.pdfIn PDF document text
    • http://pekagotikoweguf.epizy.com/rasudetimenofapofedom.pdfIn PDF document text
    • http://linakagiwabofa.epizy.com/palaxeziretusilug.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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 5208 bytes
SHA-256: a3be3af54ea0fc0325d961ff81d14285afc16129f63332405c73f40840e7626a
font_01_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 10380 bytes
SHA-256: 72406ad1382f8a9f79957c5cf3f772f3b72d7f8e437d491397cb6a04d33bf8d1

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