Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93f3591afd3cc17…

MALICIOUS

PDF

73.0 KB Created: 2020-11-23 02:54:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c30076c22bc21b41713ca78c633d0778 SHA-1: a49b602cd0419fd3feb68391200dbb05e9ca3455 SHA-256: f93f3591afd3cc171f59153d960bbde095a98ac362954762414ca3f17b87a7c6
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting critical heuristic firings for malicious redirector links and a link farm. The document body, though partially corrupted, contains references to 'Iphone 6 motherboard' and 'wkhtmltopdf', suggesting a lure for potentially fraudulent purposes. The embedded URLs point to known malicious redirectors and a large number of other PDFs hosted on disposable domains, indicating a coordinated effort to distribute malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=iphone+6+motherboard In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_5f976057d43e3.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/damudupixi.pdfIn PDF document text
    • https://mesumubanok.weebly.com/uploads/1/3/4/5/134507600/8274700.pdfIn PDF document text
    • https://xajapeni.weebly.com/uploads/1/3/4/3/134341300/xukixo-dorumukinajaxe.pdfIn PDF document text
    • https://jidugurulepapol.weebly.com/uploads/1/3/4/3/134310086/bd87f9bf69.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/0f4d4aa85f9126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488574/normal_5fba0cac18990.pdfIn PDF document text
    • https://pufotawimudob.weebly.com/uploads/1/3/4/3/134380049/4203225.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/nalowoxuzobide.pdfIn PDF document text
    • https://boxolajabamofi.weebly.com/uploads/1/3/4/3/134356625/405256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/908d76dd-4012-41c0-819b-d52d7b1aee93/95539948650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fbc79e9-994c-45c0-9e22-5cd4dbeea64d/wolilinaged.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/happy_new_year_2020_animated_images.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/performance_appraisal_sentence_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/74022550814.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_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 5220 bytes
SHA-256: 602016f630cc41b8854f662d27d7136a944526f38f66f16cd8247abf5493e91f
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 10572 bytes
SHA-256: 6e7c453b38a615e712b3e0041ddc924b7c7564522e51583f749ac4d66dc3758d

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