Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc82919880d8b219…

MALICIOUS

PDF

76.1 KB Created: 2021-02-25 19:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 21196cffd4a154d5bfce2f3843e30161 SHA-1: 980f259571b8f89a66fbb1d383a320c42cad6647 SHA-256: bc82919880d8b2191d386e848e7910b9243115b680de41a214adb3bd90026ba4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains numerous external links, forming a link farm, with the primary URL being 'https://bologen.ru/award?keyword=which+book+comes+first+in+the+lord+of+the+rings+series'. The document body, though heavily obfuscated, suggests a lure related to a book series, likely to trick users into visiting these malicious links. No scripts were extracted, but the extensive use of external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/award?keyword=which+book+comes+first+in+the+lord+of+the+rings+series PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5fdbb083ef5ab.pdfIn PDF document text
    • http://retelikilerodad.iblogger.org/fupibujofineronopareji.pdfIn PDF document text
    • https://lokejarezuwomi.weebly.com/uploads/1/3/0/7/130776656/5183671.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375886/normal_5fdc9d98c1548.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/aPPjbts/xedejidibonubinivaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_602b8dd5f4053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387224/normal_6006fe114d7f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5fe13ba0c09c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_602e3d1883cc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_601061cfb9900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_60126d9708c43.pdfIn PDF document text
    • https://cdn.sqhk.co/ketegobuto/jg2gcuN/9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/53395179423.pdfIn PDF document text
    • http://xesawufozimiki.epizy.com/96821301141.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 5440 bytes
SHA-256: 491b430e238dea92c3e817e82d4a97ab2495e39d8f9b51963469fe434dce2d1d
font_01_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 12272 bytes
SHA-256: dd11c885a1a0677d4b5b445acb9451b1ad53ab489285f0c760866873f3c7dcc6

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