Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b513196862c559…

MALICIOUS

PDF

78.2 KB Created: 2021-03-21 01:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 300a65fec7ec3fe42d87bd10f4995cd1 SHA-1: 1a262b219ab1906de4b3564e60c5ad0bf817516d SHA-256: c0b513196862c55910798cdd63e1d86b6baf0f2589693f7db2ae524f4a2faacd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=ball+blue+book+guide+to+preserving+pdf PDF link annotation
    • http://fionainthefield.org/pivusitemowiwifapet4yhi.pdfIn PDF document text
    • http://topsalon.xyz/nokabaselotehcs35.pdfIn PDF document text
    • http://tronreserve.online/diwusajefuvoladebimivadqung.pdfIn PDF document text
    • http://gogogoinst.xyz/what_is_a_half_human_half_horse_called34wg8.pdfIn PDF document text
    • http://gigogon.22web.org/taragusuzarajof.pdfIn PDF document text
    • http://todayshop.website/bharat_movie_song_._comtnm56.pdfIn PDF document text
    • http://urologo.store/trane_xv95_red_light_blinks_4_timesba2di.pdfIn PDF document text
    • http://amorexpo.com/33577141506glbr0.pdfIn PDF document text
    • http://junijaseru.iblogger.org/how_to_replace_toner_on_samsung_xpress_m2880fw.pdfIn PDF document text
    • http://goodsun.fun/alibaba_indonesia_apkzrsh9.pdfIn PDF document text
    • http://nobizifawuzim.iblogger.org/ruvexejilakoze.pdfIn PDF document text
    • http://italysummer.fun/dixezuzawapo49dtj.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/8piyuAb/bob_valenti_mystic_service.pdfIn PDF document text
    • http://fanogizakelime.iblogger.org/winston_churchill_speech.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/aY0hbIa/60522284391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd8855a5-0946-4b74-98b3-fd824ce7f222/how_much_sentences_should_a_short_essay_have.pdfIn PDF document text
    • http://mevezexagugon.rf.gd/anonymizer_for_kali_linux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d89fe6e-4018-4dc6-a9c2-cf8bdf35cc28/dilazunufenul.pdfIn PDF document text
    • http://zotuzibufuvonif.rf.gd/bi-_weekly_budget_template.pdfIn PDF document text
    • http://bigazixipiw.rf.gd/longhorn_beetle_bugguide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88608a2-be60-498c-9894-be2cb8ba3de8/32370809145.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_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 5520 bytes
SHA-256: 835702f16d6cd88c4d2f28259556b4adf87f7fe918893cfaef40b6c49709ec19
font_01_sfnt_off00010453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 11416 bytes
SHA-256: 890beafe6d5ac860882032ca1a7d6ebd38e216929e14aa3fa7a26493e039e252

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