Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b45fccc93197a64…

MALICIOUS

PDF

84.9 KB Created: 2021-05-31 12:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 640cc28d93097a8489ebaa49b4576d72 SHA-1: ce519eaad977edabb6dfe47b8cfc9b78a0d7292d SHA-256: 2b45fccc93197a64b2a2795ef276cedce4a1ed1419ac145af0b485415d583ac8
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://bologen.ru/strik?utm_term=songs+about+bad+mother+son+relationships PDF link annotation
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/gidibavefujir-bovigofudodexiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_5fe721ad0e00b.pdfIn PDF document text
    • https://taboxalitipema.weebly.com/uploads/1/3/4/5/134581752/4100957.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417226/normal_5fc9ec92ee17a.pdfIn PDF document text
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/mineg.pdfIn PDF document text
    • https://papilezuserif.weebly.com/uploads/1/3/4/4/134437149/ec7b62e.pdfIn PDF document text
    • https://vutuwibomakupir.weebly.com/uploads/1/3/2/7/132740747/3c123b413077dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_606b37387fae6.pdfIn PDF document text
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/3ade56311049f.pdfIn PDF document text
    • https://vekupaju.weebly.com/uploads/1/3/4/4/134479754/gojijivis_ferixijufesub_giluzukugebewa_zaviferelubuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_600f0e145fbc5.pdfIn PDF document text
    • https://rovinimowi.weebly.com/uploads/1/3/4/6/134682499/lesefurorebuwu.pdfIn PDF document text
    • https://funogefoxareso.weebly.com/uploads/1/3/4/0/134041001/7528e0e954210f.pdfIn PDF document text
    • https://nogudoge.weebly.com/uploads/1/3/4/0/134017621/2976633.pdfIn PDF document text
    • https://nopubekekav.weebly.com/uploads/1/3/4/5/134511336/tivelej-bazixidiveraj-sezedoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_5fd105b45ab53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_5fda1494c6a85.pdfIn PDF document text
    • https://pujawemufupu.weebly.com/uploads/1/3/2/6/132680931/644c3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482230/normal_605b00c609411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_5fd1ba579a3fb.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/e68c456e-e835-493c-be0b-2f5585be0979/siruxejewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0946727-30d9-4e90-a706-4d02f6b6ff98/how_to_reset_a_toner_chip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9c6da8-8cf9-45c2-a019-487b3707be87/gospel_of_peter_greek_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863c9fb1-080d-4d9d-84ab-7525efd5e225/husqvarna_yth24v48_parts_list.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_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 5616 bytes
SHA-256: 08167025a9d0ff3908e01a002e14ac33404da050d1d862b13368c0a55b0a4523
font_01_sfnt_off00011e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 11132 bytes
SHA-256: 5fcfc5cdc35c91b03d1aff79dae966c815e045fc2497c73a7876201039d32fb3