Malicious PDF — malware analysis report

Static analysis result for SHA-256 578d35d1b0b38915…

MALICIOUS

PDF

80.5 KB Created: 2021-03-26 18:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 30fa9a9e58e457be07a08ef43d7ddd25 SHA-1: 2ba67b035db0abb316758c50a8818a78b6ab5b0c SHA-256: 578d35d1b0b3891571b5bdb37e8b2fed0e035563623f2eb391fd073bec1b4c25
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=how+to+make+dunkin+donuts+frozen+mocha+coffee PDF link annotation
    • http://dirtygirl.fun/hunger_games_book_1_wikipediasehuh.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/jjgiij9/inside_out_coaching_grow_model.pdfIn PDF document text
    • http://top-agent.ru/cuerpos_de_psamoma_tiroideskzqpx.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/dabikej.pdfIn PDF document text
    • https://tuxakosubulep.weebly.com/uploads/1/3/4/0/134012578/penuvofone.pdfIn PDF document text
    • https://zonotilikoper.weebly.com/uploads/1/3/1/0/131071062/faguvugo.pdfIn PDF document text
    • http://juilopkiretlo.ru/polk_audio_subwoofer_psw350_manualadgv2.pdfIn PDF document text
    • http://mbfsopg.com/how_to_form_questions_exercisesk6tb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_600a16d7af7e8.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/a6jcWFu/44954577655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_6055730d0b203.pdfIn PDF document text
    • http://reduslim-italia.website/12544027048x20r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_605b9c6cab8b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fenatagazise/57216915773.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/creatine_kinase_mb_isoform.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/chatrapathi_movie_telugu_songs_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/pizegusalun.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/42403089667.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/wtva_sports_reporters.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 5280 bytes
SHA-256: 348469d64275576972701f0f2ccecfff54ca711672db2c32f354b7ba9c61e4fb
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 12408 bytes
SHA-256: 42faa36c429e205360997c58cbafc0200e370a0b260e3ecfde00cabd58a6194e
font_02_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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