Malicious PDF — malware analysis report

Static analysis result for SHA-256 664d4bda116daf56…

MALICIOUS

PDF

82.9 KB Created: 2021-04-24 13:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9ba496fcf676891a36f43e0a47df8d84 SHA-1: 42a1ffbb7e5529888241f3e1d3ab86da00edbfbf SHA-256: 664d4bda116daf56e81f53d75f926c30fc21bcd427de46a8a2abf73783bd93a0
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are associated with link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/strik?utm_term=boss+dd+200+delay+review PDF link annotation
    • http://fekevopimibun.sportsontheweb.net/push_sapphire_quotes.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/48908003483.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/98280344750.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/86600921136.pdfIn PDF document text
    • http://wiboratiraveguw.mygamesonline.org/pathogenesis_of_alzheimer_disease.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/soduxijunot.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/berger_paints_interior_colour_catalogue.pdfIn PDF document text
    • http://lonemap.medianewsonline.com/99533261333.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/30784061848.pdfIn PDF document text
    • http://dowuwomili.iblogger.org/antibiotic_classification_table.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/barthel_index_scoring.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/nolarifaforuxop/gadowinava.pdfIn PDF document text
    • http://puwomuf.rf.gd/human_cardiovascular_system_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/zakagemivixefezurixikos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/983b9237-139d-4d58-93d4-10ace8421b1c/fosexokugumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6551e10d-1cf1-46e6-afef-ba831bc4478b/stock_and_watson_introduction_to_econometrics_4th_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/52563751346.pdfIn PDF document text
    • http://kixasudasiwub.epizy.com/paxituxawi.pdfIn PDF document text
    • http://vosivoru.epizy.com/tapinoliwavuvorekow.pdfIn PDF document text
    • https://6e00f30c-c2f4-4f8b-b3fa-04142e93d3a6.filesusr.com/ugd/7b3c9f_881efd98a320433abba78e7c60d9058a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/65337544873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa48bae-dc62-4678-b257-ca0e3343a94b/loxejuvemo.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_56cd6c62690e4d32a0f7def51dcfae5a.pdf?index=trueIn 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_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 5396 bytes
SHA-256: 8b5ee189ada813f81a42c2781c099c101efe5328b126bee874d95b9223ef3aa3
font_01_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 11708 bytes
SHA-256: da0eb5dc6fe7c4da50e1bed792745e84afe1b50b5dd87fa552c4654a24cacfd4

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