Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66ceb86706fb1a5…

MALICIOUS

PDF

73.2 KB Created: 2021-02-20 21:33:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 461639eb542bbea7f77071f525558ec3 SHA-1: b7ea1c65afd34622484ed5d1b910e8db471c4f10 SHA-256: b66ceb86706fb1a56da0b66224efb83c2bd2fd4b924e9bff8b73bbf0df62c61a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are flagged as suspicious or unknown. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of links, suggesting a link farm for SEO manipulation or malware distribution. ClamAV detection and ML classification confirm the malicious nature, identifying it as a phishing trojan. The document body, though partially obfuscated, mentions 'List of nicholas sparks books made into movies', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=list+of+nicholas+sparks+books+made+into+movies PDF link annotation
    • http://zinularurupokim.iblogger.org/65629090152.pdfIn PDF document text
    • http://aazzzry.space/zutigucrhmo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487897/normal_5ff77fc9d2d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481409/normal_5fe853502c8fe.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/a343eaf165248a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401545/normal_6001598598c6f.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/wavig.pdfIn PDF document text
    • http://mivetys.xyz/theme_for_oneplus_x_hd_wallpaper_downloadgpcfz.pdfIn PDF document text
    • https://runanusug.weebly.com/uploads/1/3/5/3/135313332/movobukudobopebixede.pdfIn PDF document text
    • https://webutukokixomuw.weebly.com/uploads/1/3/5/3/135317122/mogulamiwiwok-jezekukata-kiwumi-mubujep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411681/normal_5fffbd0b83e42.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/wixamupelinere/systematic_botany.pdfIn PDF document text
    • http://filazit.epizy.com/limiting_and_excess_reactants_chemistry_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/53218927347.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/zenesutebodaxegiguviv.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/64867552206.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/67025175712.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/royal_order_of_adjectives_worksheet.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_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 5600 bytes
SHA-256: fb5941bd822efbffabdc3b41e919161cedecc322121bf9a142b0c633f56fd18c
font_01_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 10564 bytes
SHA-256: 3a08ef9fd0e9867c64b735cbe81c930ac585cce326549a699e1b2fd6c9af15e4

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