Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd3fb7ece03f474…

MALICIOUS

PDF

83.5 KB Created: 2021-05-31 22:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d160b348994daa4f2f83b7c999f70917 SHA-1: 14fe239de7f9e02f09eb8c380c0152121ec66dba SHA-256: ccd3fb7ece03f4748dae7cc9588098cc8f29f08bc874cad62f0b360984d3d7aa
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to drive traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/pbw?utm_term=lord+murugan+songs+mp3+download+tamil+masstamilan PDF link annotation
    • https://sapefesoj.weebly.com/uploads/1/3/1/4/131453354/5bf25326ca32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_6059cd9628f86.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/rinisif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5ffbeb426ac15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403414/normal_60010894ecea0.pdfIn PDF document text
    • https://xugasejesakegeg.weebly.com/uploads/1/3/4/6/134617370/favuraweje.pdfIn PDF document text
    • https://direnebem.weebly.com/uploads/1/3/4/6/134641367/degagir.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/pamipepojuzizen_zitoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_601aaef1d713e.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/3662cd63-f0b0-448e-afa8-e4f8208c8702/94668099857.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144420567/mibezusaveno.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144415905/90599145744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37389a0c-1e2d-4d0b-b76a-aea38fdd4421/49195318941.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/f/is_eating_too_much_fruit_and_vegetables_bad_for_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/806e25fd-6b1e-4df4-adaf-1055cdf0fcd5/82984265608.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144424821/31470588362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0086319a-cf1e-4a03-81fa-9307d97b8b27/4933945546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d59559f8-ee54-4f32-aee8-e0b4d6f366a4/can_emdr_cure_ptsd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa22f85-072a-42a5-8f04-8d280b4e8f4d/38216500260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76fe427-4e4a-4965-83c3-dd38d577f887/langley_toastmasters_easy_speak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c97f047-c396-47df-a444-2ea4d026ecd1/tamujime.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144417126/download_game_sword_art_online_infinity_moment_english_patch_2.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f30b60-20e1-4fdc-bfee-4b8399b17864/76429292357.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
stream_004_off00010082.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10082 10292 bytes
SHA-256: e16308074d8f2aae13099f7483351aa37062127e1aa8926080701fcd5a5e1825
font_00_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 5476 bytes
SHA-256: 11f865caadcea438edcfd5320058bc3b7b099b0e801340b71d35c1728bd44755
font_02_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 10304 bytes
SHA-256: 5260686b5d26baae45716535ea336e64d2fe6c7c1403ad41fe7a9a3406c88b06

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