Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1482f743d387202…

MALICIOUS

PDF

77.3 KB Created: 2021-03-03 10:35:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 55ff52cdd16b763a1885664b5e941170 SHA-1: ac3c21babfee776f94fc960ddb1d83efcf19f6df SHA-256: e1482f743d387202bc073fad221e9b4e6492827216a7afd3a11860c83df4a1a0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and the document body, though heavily obfuscated, contains references to URLs and the wkhtmltopdf tool, suggesting it's designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

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://golowaki.ru/123?utm_term=the+wrath+and+the+dawn+book+read+online PDF link annotation
    • https://cdn.sqhk.co/gidulikegel/JOgenrT/39280900868.pdfIn PDF document text
    • http://rastet-malysh.ru/67548483016ovkl1.pdfIn PDF document text
    • http://antonioit.fun/how_to_install_harmony_youth_booster_seate282n.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/is_tokyo_ghoul_season_3_coming_out.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/mtd_46_inch_mower_deck_parts.pdfIn PDF document text
    • http://astrology-personal.online/romeo_and_juliet_star_crossed_lovers_quotewls37.pdfIn PDF document text
    • http://pifowovumuwe.medianewsonline.com/the_fast_forward_mba_in_project_management_4th_edition.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/wuvefonetememoxuva.pdfIn PDF document text
    • http://supfitket.buzz/zuwoniwokegxoni.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/ji4I9QC/26464062634.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxonemor/jcwhceG/45141220913.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/niwekimovonidexaki.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/gjeib41/66175128937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibemodida.myartsonline.com/java_8_stream_foreach_add_to_list.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/34178132492.pdfIn PDF document text
    • http://sujekafejawojav.rf.gd/ananda_vikatan_news_about_ajith.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/80059205191.pdfIn PDF document text
    • http://bitines.myartsonline.com/40308573633.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/consonant_blends_flashcards.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_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 4980 bytes
SHA-256: 48c7eeff142bf75f336cc34ca08f710e4b7af305cad673202cbf1eb84d48e810
font_01_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 10252 bytes
SHA-256: b23cb9e29d50168bd56740345553c39b01c4d5100da0c0b1fc1b930e7206b0ee

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