Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a352dae3b5b09d…

MALICIOUS

PDF

76.7 KB Created: 2021-05-27 19:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7344a057c90b275fe3678d7fdfaf60c9 SHA-1: 5582dfd7158254e5f9ae879b16b4ce08f4c34258 SHA-256: f8a352dae3b5b09d1b91fc75dcc9cbc01b27cb9449a1030ff0711f617ae9b7c8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://botokaw.ru/strik?utm_term=halifax+county+va+arrest PDF link annotation
    • https://gowajepev.weebly.com/uploads/1/3/4/9/134900038/253520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_6010b6862d091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427828/normal_6066f5847d464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_603c866eefc26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_600f3ccc466d3.pdfIn PDF document text
    • https://waxagenejefud.weebly.com/uploads/1/3/4/7/134712445/romuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453718/normal_603f0806151df.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/dowunabofij.pdfIn PDF document text
    • https://wapatawavef.weebly.com/uploads/1/3/4/7/134775304/03f8c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_6019112dde076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_60660103daf8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464302/normal_5fed12cb9f860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_604699a25b2d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493905/normal_604b10c70f98b.pdfIn PDF document text
    • https://fifosekula.weebly.com/uploads/1/3/4/0/134041306/ruvowupapefoz.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/68823b55-828f-4d81-a62a-235be18ace3c/pamujenagavanomajakazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56af6561-9db6-4304-874a-c93cc1b7048f/is_acupressure_covered_by_insurance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f6e6b3-b491-401e-b2b7-a561c7535aae/meaning_of_verbal_communication_in_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c9b21c-836d-4910-af4b-40388e0a2c37/limasekod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d409be28-f404-469f-a786-b5a30fdecc2a/61951014934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6059b04c-6107-456b-8bac-83b50d879b58/93503889316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd859f4-2021-4c0d-b1e5-b99f7230a417/33525710769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f60abcc-d99d-4f90-b9e9-de682226692d/10744280654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d5dae4-d7d1-4792-8581-8be62a80ce7b/diary_of_a_wimpy_kid_movie_2_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d244e7c-0226-46e1-a921-eb52aacf7650/ruxiseve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9ebdd0-15ce-4bd8-96e0-d255c76723b5/vumewuborelopopufinegep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab3fe36-e10e-40d8-b0dd-131f708abded/murachs_html5_and_css3_4th_edition_online.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_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 5064 bytes
SHA-256: 404e6844f70cd26bdd7d5c1a501c1c7a3f84ae6d25171a04cfae2fc184d46b2d
font_01_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 10744 bytes
SHA-256: 619e13cebfe9009289ec49213f2f5fff37af218b408c57a683c2d27b095c727c