Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ef893c33192f6a…

MALICIOUS

PDF

80.4 KB Created: 2021-04-16 16:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d5d97ffde58c29a0f8e5faeb3c406ed4 SHA-1: 2a8cabb9f626184e92f235044ba54e410c571515 SHA-256: 58ef893c33192f6a6a3b111d643852357f94d5a41aee36dd55c26634548ecbf0
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or scam operation. The primary lure appears to be related to career advice, specifically becoming a medical receptionist in Australia, directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=how+to+become+a+medical+receptionist+in+australia PDF link annotation
    • https://cdn.sqhk.co/govazofaj/ivgGheC/card_maker_creator_for_crc.pdfIn PDF document text
    • http://rezltml.xyz/54800022726zkpdx.pdfIn PDF document text
    • http://pumba.fun/autocad_house_drawingsadmeb.pdfIn PDF document text
    • https://cdn.sqhk.co/xilelawemu/E0hcNgg/nesajigaw.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/7jd3Rii/imagenet_pretrained_model.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/bIuigha/valentine_s_day_crossword_puzzle_printable_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/jovHLig/kovovedufodemagobidox.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/67410680171.pdfIn PDF document text
    • http://optalpha.com/the_congress_of_viennas_plan_for_european_peace_worksheet_answersvg3i8.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/gbgdgeW/easy_metallica_drums.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/5978737116.pdfIn PDF document text
    • https://cdn.sqhk.co/geruvijiwiw/hbQsWhe/fipaxogejapamen.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/takurugilij/sovetalulukudu.pdfIn PDF document text
    • http://kepewitibafef.myartsonline.com/86592459520.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/72863111551.pdfIn PDF document text
    • http://jupevesu.atwebpages.com/sample_of_job_letter.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/how_to_watch_game_show_network_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/84275008950.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/elgato_hd60_pro_connect_your_capture_device_to_get_started.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/how_do_i_pair_my_directv_remote_to_my_receiver.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_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 5412 bytes
SHA-256: 7af098554aa74582503ad0fbc0a63eaf7c945e2169e27175db2f17711f385410
font_01_sfnt_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 11544 bytes
SHA-256: 83c62eaf7c68da469a58e7a7f77876996729a37f12e6f067bf03033e075ed989

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