Malicious PDF — malware analysis report

Static analysis result for SHA-256 238c5195f8cf75d2…

MALICIOUS

PDF

71.9 KB Created: 2021-02-24 18:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7751f8c0a4adb5740bf2327604217bfb SHA-1: 92b1dd18784c594e0188babf8f75be61c6994b21 SHA-256: 238c5195f8cf75d2f33fc69fdc6138a425cefd4ab082dcfeaf7803a832fa2d2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/123?utm_term=whirlpool+refrigerator+filter+3+amazon PDF link annotation
    • http://fesotisifofil.mygamesonline.org/should_i_use_a_salicylic_acid_cleanser_everyday.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/SkOgcUH/frases_de_amor_en_ingles_tumblr_traducidas_cortas.pdfIn PDF document text
    • https://pefolasonej.weebly.com/uploads/1/3/4/9/134901659/zobefelubuf-xiroxax-mifuvosere-gawunitelurujev.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/ieYiivn/74766451571.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/presto_pressure_canning_instructions.pdfIn PDF document text
    • https://zekenegelu.weebly.com/uploads/1/3/4/3/134390475/rejux.pdfIn PDF document text
    • https://vipapixamez.weebly.com/uploads/1/3/0/8/130814430/9610ecd.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/jh9jg89/bandicam_watermark_png.pdfIn PDF document text
    • http://pefuwujoxuroj.iblogger.org/backend_template_joomla_3.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/salojas-mizifi.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/vjhjajg/koralefulajojidizom.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/aTgjjjO/tajiwobuz.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/how_to_program_seiki_remote.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/remuv/luzaxegowumu.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/early_childhood_development_agency_form_5.pdfIn PDF document text
    • http://favisosemetidid.rf.gd/62800841269.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/4478792859.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/sub_zero_fridge_repair_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/buchi_rotavapor_r-_3000_manual.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_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 5364 bytes
SHA-256: 69f572a9ec5d73758c2583fdea02968cad67871fb222b2108c2624d92ce88dae
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 10916 bytes
SHA-256: 6b2bf369f73d417a6b9cd5243f27041ee011a5f3e0a2d291fc75019180713358

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