Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e774d21753b8850…

MALICIOUS

PDF

76.1 KB Created: 2021-02-16 22:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 199d87873ebbe91392f1d27987ac5748 SHA-1: 39b42c57760a9b026b832b5330111d9234e8fbca SHA-256: 0e774d21753b88503ec47d8b3ff03bfc9a8c89dba7abd4de4aed1d8bc8a0f22b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, a common tactic for phishing or SEO spam. One of the extracted URLs, 'https://bologen.ru/strik?utm_term=journalism+internships+summer+2021+nyc', suggests a lure related to job opportunities. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites.

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/strik?utm_term=journalism+internships+summer+2021+nyc PDF link annotation
    • https://cdn.sqhk.co/nigezufi/7APOnjc/gun_ringing_tone_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/ggMiegf/call_of_mini_zombies_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/e7A9jgh/spirit_riding_free_wall_decal.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/sosezo.pdfIn PDF document text
    • http://radapox.iblogger.org/math_volume_worksheets_printable_free.pdfIn PDF document text
    • https://sikiwakasizo.weebly.com/uploads/1/3/5/3/135318116/28f2553.pdfIn PDF document text
    • https://katinena.weebly.com/uploads/1/3/1/3/131383377/lujuxi-bajew-xofuwu-dovazuviwotowi.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/wovigebi/bluffers_guide_to_world_cup.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/ingleton_primary_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/bamosukavajovezemijajuguk.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/fisco_agenda_2019_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/zedolizofojekafigap.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/67054720691.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/45867242485.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/lock_vs_semaphoreslim_performance.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_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 5592 bytes
SHA-256: 3dd93dfcc4c223c49e8d33077ee481d812b71f57514599184a3538c48bc281ed
font_01_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 11064 bytes
SHA-256: dbf6c34c6af9a8c474fdeedaf00fcec3319058002514359eea3c7388261a6ae2

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