Malicious PDF — malware analysis report

Static analysis result for SHA-256 f813190114f18a82…

MALICIOUS

PDF

74.8 KB Created: 2021-06-06 08:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9e2f0479db2e46a970e6d80e3ab12ab4 SHA-1: 8b7be065ad1c5afd96ddd75b27b14f1622020364 SHA-256: f813190114f18a8278aba5c90b203258b26da084513c34bc538332f95713da21
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or leading users to phishing sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://cructi.ru/pbw?utm_term=is+there+a+tv+guide+on+firestick PDF link annotation
    • https://pawapuso.weebly.com/uploads/1/3/4/3/134312868/xepipimoror-xelawinogonaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_604348a48ac8a.pdfIn PDF document text
    • https://wadagubabu.weebly.com/uploads/1/3/4/7/134709622/xemiraz.pdfIn PDF document text
    • https://jozudepixivi.weebly.com/uploads/1/3/4/6/134682498/zevufi-xiwukod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_6035c889e598f.pdfIn PDF document text
    • https://mibaxezaju.weebly.com/uploads/1/3/4/6/134641270/1973997.pdfIn PDF document text
    • https://kesobimagebow.weebly.com/uploads/1/3/5/9/135978915/74f83d3e920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_603c486aa31c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369926/normal_6008c7867cc2e.pdfIn PDF document text
    • https://pulamawuba.weebly.com/uploads/1/3/0/8/130873907/3422236.pdfIn PDF document text
    • https://ribufesoguvas.weebly.com/uploads/1/3/4/6/134680119/pegis_nizerajibeweniz_pulofawij_jiropol.pdfIn PDF document text
    • https://kikeletiwemuk.weebly.com/uploads/1/3/4/6/134671512/voxusenarojuravedig.pdfIn PDF document text
    • https://gonudelosake.weebly.com/uploads/1/3/4/7/134750135/109264.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/2adf9000-c687-4863-bbf7-87f7a2adf7d6/vebasuzipakosoferika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658c300f-9078-4acd-a3f5-4ab0284276aa/pijebinijuxibugurez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9aaba35-f70a-4159-b86d-bea9101415e8/niretalaxupemebulipoduxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9381678c-7e8c-4ed6-a3f9-77ae991fa50f/68850859330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9200e77f-4283-44f3-97a1-fb29855add0b/74282370851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a895828-45b5-4bb8-ab0f-ff88ffb6a71d/83277237992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acaacc37-0e5c-4cb0-90c4-d9544a0163c3/furepekorumuwax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55460a89-f5bc-48bf-aa28-6a3cd57db4a3/the_virtue_of_selfishness_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f087aa30-4b77-4108-ad18-e27ee72f16c8/onkyo_tx-nr525_bluetooth_adapter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5c5a8d-3746-498b-aa48-09c2f26195ac/bamiredolinagilu.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_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 5312 bytes
SHA-256: 5b5b0eaf880c25b6761ecb72fe5721d3644fb0742f6f740e6e6f685302e7744c
font_01_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 10944 bytes
SHA-256: 85e2c043a6d4e1bd34433fdcbda6923c7548c16316bf61428a7e0a7efb0e4efc