Malicious PDF — malware analysis report

Static analysis result for SHA-256 3177c8a2b5f51803…

MALICIOUS

PDF

76.8 KB Created: 2021-03-25 05:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 670436323e96d6509f007ed9259e1e96 SHA-1: 5249bc258395e7131dbacae4d4be297e40e20500 SHA-256: 3177c8a2b5f518031c9af4b4c16a38c7bace7f3eda3f3406c605e7bbdaa80300
136 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'Walmart tv black friday 75' and a high-confidence heuristic firing for PDF_SEO_UTM_REDIRECTOR_LINK indicates it leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest a phishing attempt to redirect users to malicious 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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://nipisod.ru/strik?utm_term=walmart+tv+black+friday+75 PDF link annotation
    • http://trendmobile.ru/sovivosazidus0yc5n.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/b1jjgh9/48197899501.pdfIn PDF document text
    • http://oneplusonemain.xyz/ravesawurejedewexeto7dw.pdfIn PDF document text
    • http://dabosesavedevet.medianewsonline.com/zopabezekewazid.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/GtSuPgi/imagem_da_masha_eo_urso_png.pdfIn PDF document text
    • http://feyakast.online/nomumumuximkld02.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/hnijii0/89209197568.pdfIn PDF document text
    • http://antonioit.space/518456615337rk4v.pdfIn PDF document text
    • http://pubggaming.online/dorkie_puppies_for_salec9bnz.pdfIn PDF document text
    • http://localdesign.me/solution_focused_brief_therapy_exception_questionsfv08t.pdfIn PDF document text
    • http://sakepugikunon.mypressonline.com/26163514420.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jhibGmF/16491166385.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/41867768536.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/mokamoba/89347529636.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/54239804402.pdfIn PDF document text
    • http://dozopedatofol.atwebpages.com/tnpsc_maths_aptitude_questions_answers_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/ultimate_mma_strength_and_conditioning_training_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/how_to_get_through_the_trial_of_the_labyrinth.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/old_school_chevy_cars_names.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_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 5572 bytes
SHA-256: 1559094feba35adb5f3b5907086ed55ab865119ebf0d777f3f631840f9b39c1f
font_01_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 11448 bytes
SHA-256: 8184fe5d42585bd14268cb02dae5a1f48bc675b0634a8696306455064854a27f

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