Malicious PDF — malware analysis report

Static analysis result for SHA-256 971cf44f32127e0d…

MALICIOUS

PDF

79.8 KB Created: 2021-03-04 22:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0a4c71603dbf2b314a3da3b895640e7e SHA-1: cd0f4e45b570db99184d74b6ca160bbc19cadb75 SHA-256: 971cf44f32127e0db329324a7e54bb279bb39f6a259698fabab5c7fc681c9b90
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://pelibifir.ru/strik?utm_term=club+car+48v+charger+for+sale PDF link annotation
    • http://nakozek.mypressonline.com/how_to_clean_print_head_brother.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/60701188626.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/percy_jackson_the_sea_of_monsters_book.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/the_lightning_thief_graphic_novel_epub.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/29307473927.pdfIn PDF document text
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/22fb089.pdfIn PDF document text
    • https://kafememum.weebly.com/uploads/1/3/4/6/134616831/laxovobowesaxo_vemovewazizoluw_werudokir_jipuwavisusuj.pdfIn PDF document text
    • http://josebixotarez.22web.org/jofaporonajupubuwexizoz.pdfIn PDF document text
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/diwizura.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/gufunogokerukip.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/how_to_factory_reset_samsung_a6_tablet_without_password.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzuviwuk.rf.gd/26531842527.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/how_to_change_a_lightbulb_in_a_ge_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/16609342948.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/what_age_do_star_charts_work.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/musiholiq_abangani_song.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/49153708152.pdfIn PDF document text
    • http://wuvitunotiv.rf.gd/kaz_humidifier_v745a_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/abcd_song_form.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_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 5528 bytes
SHA-256: a2c45750856d52dbcaef8208054099e5444449f28aa0cf2241cac9addf15652e
font_01_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 11752 bytes
SHA-256: 498b6c226f9abe580b898b98e6cfb27114991b52c3d239e543bf836b49458552

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