Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c8263713cb2068…

MALICIOUS

PDF

77.5 KB Created: 2021-02-10 18:37:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9ec5fefe7c7212c74310c0d67d3140e7 SHA-1: e48b39fe43059f63af23557ea50bdc731df3d6c5 SHA-256: b7c8263713cb20689513b9f1665ba738850c99ab785ddaa8be0d75f5bd7d029e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=quadratic+equation+solver+fraction+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426085/normal_601de86d78664.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/f1f4f40d79b73c2.pdfIn PDF document text
    • https://befunopokoxa.weebly.com/uploads/1/3/5/3/135327779/1466352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376866/normal_5ffb2fb9251df.pdfIn PDF document text
    • https://cdn.sqhk.co/dapalufited/ggqjdiQ/bts_korean_music_festival_2014.pdfIn PDF document text
    • http://tosanelelodidot.iblogger.org/lavewaxebe.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/hdTjcjd/chargepoint_stock_price_target.pdfIn PDF document text
    • https://gudosotavuna.weebly.com/uploads/1/3/4/7/134722070/176c6db06710e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448103/normal_5ff2bcc28db43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446166/normal_6001e774107bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rimuvuvipimube.epizy.com/vujefen.pdfIn PDF document text
    • http://sarowagilujet.rf.gd/nukezexevijuvar.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/aluminum_roofing_sheet_thickness.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/levolekelab.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/exponential_equations_worksheet_1.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_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 5356 bytes
SHA-256: bf55ae49e2d7671d1151b09c625f83932baacf5d000b5d80589ece1099381121
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 11128 bytes
SHA-256: ade863067f4705627c48b0dd6b130eb2fc23e59df2c2b46ad493cd28e5bca3c1

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