Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ba08b2735a3f57…

MALICIOUS

PDF

81.5 KB Created: 2021-03-28 11:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 092f519fff831172c5a7b422d3261078 SHA-1: d2a22fce9b9cced384e83029536dfaeef7f2a506 SHA-256: f3ba08b2735a3f578b951fe285df4f9cad07073c5c9feed5f296d8722584f0fe
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a 'link farm' heuristic, suggests the document is designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains text related to 'rca tv manual pdf', likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=rca+tv+manual+pdf
    • http://eliyalte.com/2231296731025r4x.pdf
    • http://wodasewusinoda.22web.org/game_pokemon_terbaru.pdf
    • https://cdn-cms.f-static.net/uploads/4382961/normal_604334ed5263b.pdf
    • http://rufoferapavinew.medianewsonline.com/jejidepu.pdf
    • http://smilex.club/limewomipuvajo2pi.pdf
    • https://cdn-cms.f-static.net/uploads/4454813/normal_602b6c3dedb87.pdf
    • http://dommasters.site/fovofamapelpfvd.pdf
    • http://a1metromovers.com/playmobil_ghostbusters_cartoonp45a7.pdf
    • https://cdn-cms.f-static.net/uploads/4467274/normal_605e0a0ce4097.pdf
    • http://effektzhizni.ru/ropotililedolumufjuba6.pdf
    • http://nelunufibedu.iblogger.org/pdf_split_portable.pdf
    • https://cdn-cms.f-static.net/uploads/4488101/normal_60124a0eb5005.pdf
    • https://cdn-cms.f-static.net/uploads/4527237/normal_6053c5bb0ec89.pdf
    • http://tarekupi.scienceontheweb.net/design_sprint_kit.pdf
    • http://wufamega.scienceontheweb.net/vibaluxejumukuri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_4e77427673b84b30893ab04796e23abb.pdf?index=true
    • http://zosajirigo.rf.gd/naxipagamisimoniwupovu.pdf
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_8d7d4d0bafc0466d8934f9204759d73c.pdf?index=true
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_73c0675038724a0c8993e2dfa29007eb.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_off0001016d.bin
a83f94ac39514d1387a90f7caaebaeed6d2f532ad5de8afef20cf9dc00fa330b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 5096 bytes
font_01_sfnt_off000112c8.bin
9879a39f40ac3d0ad6fed5a472128d17668608aa3286d818ff3611b782c5b84b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 11428 bytes

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