Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d0375a36a7fcfa…

MALICIOUS

PDF

89.6 KB Created: 2021-03-14 01:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f495ac71cfff83364d9c7fac708036b5 SHA-1: 5dbb1e1a7f3c1a61fc7e91a95337230e5ceb4e61 SHA-256: 33d0375a36a7fcfafd3094c28d78a417bb7bf8e2dbda81e3f88ef0c79d33c75b
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent external URI pointing to `https://pelibifir.ru/strik?utm_term=cosco+scenera+next+car+seat+lady`. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting an attempt to obscure the true malicious destination or distribute multiple lures. No scripts were extracted, but the presence of numerous links and the high confidence detection indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=cosco+scenera+next+car+seat+lady PDF link annotation
    • https://cdn.sqhk.co/jopubelo/Pgi7jj3/24512254696.pdfIn PDF document text
    • https://xavodumofas.weebly.com/uploads/1/3/4/9/134901052/nuzos.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/c142c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471692/normal_6001191c80890.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/hiXiaii/fipifovip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5fd287b8504d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_603bcbb699db1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497346/normal_5fcc52975f33d.pdfIn PDF document text
    • https://lojijuzirikoza.weebly.com/uploads/1/3/4/5/134593465/funozufogogodeb-rumowegevo.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/jcVhhjg/89596110619.pdfIn PDF document text
    • https://dejerolet.weebly.com/uploads/1/3/4/4/134444382/0b0aea9c954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_5fe8f43251ef5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ac6886e8-6b45-4bf7-b016-459cc2901a1c/yoga_poses_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ced4252-458c-40ca-949e-8c6c6e582aee/risajunugikaliwesawanas.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_a1d13baec6374c90aa489ee0f1360b4a.pdf?index=trueIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_eeee7ff5bfb4422ea2ca5db1f59a7796.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/6823736632.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/mizagetufibidajome.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 4864 bytes
SHA-256: d839b3b7f826ea1e220f4947be96c918a807a03fca2c99944aa404910483d27c
font_01_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 11400 bytes
SHA-256: 0370326b229d21a6e92b3fc2112799c25ed62208be3035af3a29b4d5b5b5b5ef
font_02_sfnt_off00014b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B40 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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