Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf8457b20d99772…

MALICIOUS

PDF

66.5 KB Created: 2021-03-29 09:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ab65f9767f427ded72d21bb4786a7304 SHA-1: 62357dd519e49e8fec229a17729f2df7ecba793c SHA-256: dcf8457b20d997722b330601509e5206296282cad1573bb810d727cdec29e22e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords like 'neobux guide in urdu' which could be used as a lure.

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 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://kuzutuzo.ru/wix?keyword=neobux+guide+in+urdu PDF link annotation
    • http://opticsystem.website/smash_hit_hack_apk7o8pl.pdfIn PDF document text
    • http://xeresorejal.iblogger.org/fijisiwepetiniw.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/adgjwhf/nike_icon_clash_woven_pants.pdfIn PDF document text
    • http://naturagrush.space/xobosiguluwenonbcqp.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/gige9Ht/sivuseditobalinuxuvigo.pdfIn PDF document text
    • http://bunokegezodidur.iblogger.org/jowivireripetet.pdfIn PDF document text
    • https://cdn.sqhk.co/mepejuwaj/hehfjfB/racing_wheel_for_xbox_one_best_buy.pdfIn PDF document text
    • http://msertis.xyz/todevofudumufom3ld9q.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/37847851083.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xokudofek.epizy.com/safety_signs_free_download.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/84230755727.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/kovexer.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/1996_jeep_cherokee_transmission_control_module.pdfIn PDF document text
    • http://kakekevuvek.epizy.com/fixutuxegaxovelupamu.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/bewofujizotiximupez.pdfIn PDF document text
    • http://paritoxo.rf.gd/discharge_summary_sample_transcription_report.pdfIn PDF document text
    • http://nekepozime.epizy.com/xeque_mate_filme_dublado.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_off0000c798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC798 4748 bytes
SHA-256: 9588f6955b8bdc7b39935ad31feb86518ec1cc6b6615185bf26323386fc4fdb8
font_01_sfnt_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 10424 bytes
SHA-256: 08e0bb5664736f002f2406f8d53eddf7496fb27aa2f39d61080f43072f1567f5

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