Malicious PDF — malware analysis report

Static analysis result for SHA-256 071052c4aa2497d5…

MALICIOUS

PDF

83.9 KB Created: 2021-03-15 03:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9ad534eea2f0cd74c00935d9a3931e5 SHA-1: ab505d3303167b1fa64984713dbcddf96ada7820 SHA-256: 071052c4aa2497d54cab48749eba61915f2fb7e79cfc85bfaced1b6906954a7b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wix?keyword=mark+copeland+bible+study+guide
    • http://dkblogin-de.best/goluxeregopizujogolurhc2yh.pdf
    • https://likemojinefafus.weebly.com/uploads/1/3/1/4/131406739/0cd2b9bf74.pdf
    • http://vowitufafuzebil.scienceontheweb.net/zusebaguvojesowaxumimod.pdf
    • https://woniwisupu.weebly.com/uploads/1/3/4/2/134266019/1940253.pdf
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/4052964.pdf
    • http://mx50off.info/total_quality_management_in_business_ethics5stcy.pdf
    • http://xajabuzowa.scienceontheweb.net/cbse_syllabus_for_class_10_social_science_2020_18.pdf
    • http://nemagufi.mywebcommunity.org/3_kingdom_classification.pdf
    • http://regsenatvumen.website/rivabuzikudotafarowapanoqlmqg.pdf
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/wafinem.pdf
    • https://wovenatoz.weebly.com/uploads/1/3/1/4/131454427/sopivepu.pdf
    • http://ziximotizaned.medianewsonline.com/polk_magnifi_max_sr_review_rtings.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/de1c51f8-5263-4dac-8941-322fc0818c19/walt_whitman_high_school_ny_yearbook.pdf
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_d1cdc7f29602438d8a7a8f4898b896be.pdf?index=true
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_fe89a5dc5bc940ce98ee3e69b2576a04.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75dc90c6-1c4b-4e22-b967-80beafe32532/22645084205.pdf
    • https://uploads.strikinglycdn.com/files/10c857ae-78d4-4e7e-9dff-8e83825d00fa/fuluj.pdf
    • https://uploads.strikinglycdn.com/files/d02ca931-bf66-4fc9-9256-21d39fdbebe8/zoxobasafe.pdf
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_2c41c126489b40b9bbc7167253dc763c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f9b91255-3c6f-463b-ad8d-f6f2c26a6085/pikixuxonejiwekabu.pdf
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_71e043ffc8154e0aa49304467b95a898.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f280.bin
90517f611346cef3827473267cf96b7a5d24bac9184ac858ac84103097c8ad3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 5552 bytes
font_01_sfnt_off0001057b.bin
ab992d4d409a263413529217ed9e176105255f3ca8caed8d153e5cc677836957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 11488 bytes
font_02_sfnt_off00012ccb.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 16204 bytes

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