Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fef730ab175bb7…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 15:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 852e68d81a3b0c48366b98111f5f7c47 SHA-1: 6f259baf8eb0dd5c169f2e9213edf7c2a63a63ed SHA-256: 80fef730ab175bb7b594a271d4dc9296d0a2250767777a08506fa5fa937dbfcd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farming and to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/award?keyword=geometric+sequence+notes+pdf
    • https://static.s123-cdn-static.com/uploads/4404740/normal_5fecae9a1a1bf.pdf
    • https://cdn-cms.f-static.net/uploads/4474475/normal_6054502f410f7.pdf
    • https://cdn-cms.f-static.net/uploads/4476758/normal_60146528750ae.pdf
    • https://static.s123-cdn-static.com/uploads/4471250/normal_5ffe52cf09af9.pdf
    • https://cdn-cms.f-static.net/uploads/4446045/normal_5fe69a26df985.pdf
    • https://cdn-cms.f-static.net/uploads/4471082/normal_5fd2d3a09d91a.pdf
    • https://xexiwimelogodit.weebly.com/uploads/1/3/4/5/134593193/b80563eae68a.pdf
    • https://fiwigerisen.weebly.com/uploads/1/3/1/4/131408459/ranazajolo.pdf
    • https://static.s123-cdn-static.com/uploads/4466366/normal_5fc836b89515f.pdf
    • https://cdn.sqhk.co/sojowidaz/3hjCLgl/capsule_function_biology.pdf
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/damet-rokuwopomigo-jekegemuluwo-ripagadisu.pdf
    • https://static.s123-cdn-static.com/uploads/4489058/normal_5fc830827c13a.pdf
    • https://cdn-cms.f-static.net/uploads/4473049/normal_602529a0a08c9.pdf
    • https://xopilinunerixaw.weebly.com/uploads/1/3/1/3/131380618/benutifinobelagig.pdf
    • https://pijatopug.weebly.com/uploads/1/3/5/3/135303623/5d6c549463.pdf
    • https://cdn-cms.f-static.net/uploads/4485580/normal_60588b192ad80.pdf
    • https://cdn.sqhk.co/sebazisop/ch1jhpx/among_us_mod_menu_android_mobile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_16b7ef7cd66c40e8ba3f16dda38f3c1a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b6a8c1df-cc56-4a83-9656-1906abab9458/romeo_y_julieta_vintage_cigar_review.pdf
    • https://uploads.strikinglycdn.com/files/40727ff1-5057-4a54-89fe-28b8fdc967c8/wadujawasutetevedugute.pdf
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_c599d090fa594260af691de54e0c901d.pdf?index=true
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_0976ea5ed5734ea58a5e9f103f6df91d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94f20ce0-7585-4bf0-9028-12fd6692b7f7/graco_magnum_x5_trueairless_paint_sprayer_manual.pdf
    • https://uploads.strikinglycdn.com/files/88fd1055-1d48-4c56-9f1f-feb6f82ef52f/kaplan_dat_book_2019.pdf
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_93a5ee56a1084c13b881668577034c1c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef23.bin
4c86d1d69f5333fd06067b4e1020579880faf1f93cf0329aa8fe310698e98bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 5216 bytes
font_01_sfnt_off000100d2.bin
525e67b3d5624dcbc9e41b3d153e92aebe9f7ac140148aa7b44399d4452bd4db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 10720 bytes

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