Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adbb0dcfa5656a2…

MALICIOUS

PDF

79.8 KB Created: 2021-03-15 21:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72156b849fc7c2a658c37f5db3912160 SHA-1: 52addfd0b821a29ac1fbeea8e788ae28161b018f SHA-256: 1adbb0dcfa5656a2e88a520c6fc2469c0351f377cdaa6b7a3b4a84352585d24b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically flagging it as a phishing trojan. The embedded URL 'https://leonvi.ru/award?keyword=monitoring+and+evaluation+tools+for+ngos+pdf' is likely part of this malicious scheme, aiming to redirect users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=monitoring+and+evaluation+tools+for+ngos+pdf
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5ffa75df79ca1.pdf
    • https://cdn-cms.f-static.net/uploads/4475992/normal_603ea485d4168.pdf
    • http://zobotalemogi.sportsontheweb.net/45264304083.pdf
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5feecfcf39552.pdf
    • https://cdn-cms.f-static.net/uploads/4421471/normal_5fd96e2d1d219.pdf
    • http://zitokujamu.mypressonline.com/gekupajitinaw.pdf
    • https://cdn-cms.f-static.net/uploads/4377400/normal_60445e217dcf4.pdf
    • https://cdn-cms.f-static.net/uploads/4410204/normal_6016c46e30b1e.pdf
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/paluz_bitif_bilamatedeza_loguvubewof.pdf
    • http://mopexaxurip.getenjoyment.net/hallelujah_for_the_lord_our_god_the_almighty_reigns_chords.pdf
    • https://livugazenexaru.weebly.com/uploads/1/3/1/6/131607095/3bdaa2fdd244.pdf
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/9898903.pdf
    • https://cdn-cms.f-static.net/uploads/4462974/normal_6017a4344deac.pdf
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/4522239.pdf
    • https://static.s123-cdn-static.com/uploads/4375203/normal_6005216812a3e.pdf
    • https://cdn-cms.f-static.net/uploads/4486751/normal_601618fc46f1e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/374e5972-7cba-425e-81e2-ab7fbd28ea23/will_grayson_quotes_with_page_numbers.pdf
    • http://zinigites.epizy.com/52861738386.pdf
    • http://situwosase.myartsonline.com/29080659738.pdf
    • https://uploads.strikinglycdn.com/files/8b01405c-e395-46a8-ab35-5efe21228b72/what_is_a_cricut_gypsy_used_for.pdf
    • http://rubipupajet.rf.gd/mossberg_590a1_m-lok_50769.pdf
    • https://uploads.strikinglycdn.com/files/08ba6d35-a206-4a0e-9674-80e262bd91dd/41820614885.pdf
    • http://fivemawafazixi.epizy.com/nazawexalawazufolovi.pdf
    • 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_off0000f883.bin
22a268cb04d0592e6aadec85ab610cffedd9a1d1e74f223fbc153b7b6ddb8183		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 5272 bytes
font_01_sfnt_off00010a9b.bin
e41a85d94dd4072553dfd3c35ca66f0fb2267834b7b6a77a6e892e0adc7cd0e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 11232 bytes

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