Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab72447da96902e…

MALICIOUS

PDF

85.3 KB Created: 2021-05-12 21:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e74eaab5e2cd6fb4f140ab48f830e3d0 SHA-1: 23b8732072191707aed48d8ad01d88552f6279ce SHA-256: 2ab72447da96902edcb3f86e7eedea470c530b5a096d77a547e45aca45f23c15
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=yahtzee+score+card+app+free'. This URL is likely used for phishing or to download a second-stage payload. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing/malware delivery intent. No scripts were extracted, but the embedded URL is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=yahtzee+score+card+app+free In PDF document text
    • http://shoes-storie.club/dabibiworeluwas4k5x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384817/normal_5fe2177c0a39f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489599/normal_606b71d481981.pdfIn PDF document text
    • http://poroda.site/love_your_life_not_theirs_barnes_and_noblec3q3q.pdfIn PDF document text
    • http://classicalnaturally.com/467231353105jlez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366388/normal_5ff02c7bd714f.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/Hfugjc1/main_street_pets_haunted_village_ghost_towns.pdfIn PDF document text
    • https://cdn.sqhk.co/misumirotoj/6uHrW2l/razubawofinute.pdfIn PDF document text
    • http://ryukzak.digital/jesitetizenublt8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_605a3e83bc2ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_60421d5f7230c.pdfIn PDF document text
    • http://eliyalte.com/tenancy_agreement_templatecgvlh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de3f7bc-d347-45b1-9985-05cf302fc692/fusexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a23c1d-89a5-44fe-8c04-725deca74ba6/simple_past_exercises_multiple_choice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518104c1-68aa-42f1-8dc0-61b379d8bbdd/what_year_was_dell_latitude_e6410_made.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/77568515485.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/kebotakewibenemojaxojino.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/free_template_wordpress_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0751a7-788a-447e-9355-25586d5a330f/jewifalosoratuvakini.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/potential_gradient_between_two_plates.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/13475232945.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/mabeboxonulixonas.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/manifesto_barisan_nasional_pru13.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_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 5220 bytes
SHA-256: 4819356cab81ce6063d605345904903c5415c61b5622309dc43e3eb10b4501ca
font_01_sfnt_off000122ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 10888 bytes
SHA-256: 6db4622aa5e9e16cdb8303e3b1e2200f791ed5effbb4463eace0984220b2931a

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