Malicious PDF — malware analysis report

Static analysis result for SHA-256 604a5f9729810e87…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 17:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 64bf827d7291a4f0f608bb341cf94bf2 SHA-1: a2685f9f1c98517f9457c2a9c68babe78b6b6342 SHA-256: 604a5f9729810e87ff30f928ef4e61e7941a32d26c8c8ee9b92279ed19307a82
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to crochet patterns, but the primary malicious activity appears to be directing users to a large number of external URLs, many hosted on disposable domains, which is characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=how+to+make+a+crochet+granny+square+jacket PDF link annotation
    • https://cdn.sqhk.co/muxigatatini/ajliefD/barber_cut_lite_hack.pdfIn PDF document text
    • http://newutatokulu.getenjoyment.net/catskills_hiking_map.pdfIn PDF document text
    • http://gunenekaroz.mypressonline.com/77353202088.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/digPicF/26844147860.pdfIn PDF document text
    • http://pelabinowoguk.getenjoyment.net/tenavageliwisukusodupazam.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/anton_bruckner_ave_maria.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/business_analysis_valuation_using_financial_statements.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/tevizimaxavos.pdfIn PDF document text
    • http://doxedisipi.scienceontheweb.net/dumokekugawenapejifutibiv.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/XQig5XQ/huey_lewis_back_to_the_future_cameo.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/fJnjhid/neduzinop.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/nibezowovijij.pdfIn PDF document text
    • http://xovitixekewelom.scienceontheweb.net/86933183133.pdfIn PDF document text
    • http://galabogenezoso.getenjoyment.net/68339691207.pdfIn PDF document text
    • https://cdn.sqhk.co/vitozogog/kuRoJW0/best_picture_video_maker_app_android.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/11192855849.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/793a1331-90a4-4d45-877b-fc7ff88d4d25/kolorigawu.pdfIn PDF document text
    • https://69669160-cc20-42a3-bfef-e1e1fd1f8163.filesusr.com/ugd/8094a4_32222ab820494083acd4be45b7c69973.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_46cbaa347a964b0486deae0c5cc24b4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f67ca407-06dd-4cf8-9da6-e27d43149970/69163302294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4104b22e-48b5-4b09-9ca4-f086ac63dd8c/65145190021.pdfIn PDF document text
    • http://vidilig.onlinewebshop.net/gekofuxobetemazeseju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b836721-9eef-4a90-af74-f3f7a063015e/how_to_measure_visual_analog_scale.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_323b856cbdd94ed09f8c1c422451f939.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2abc8b86-2407-4d70-8ffe-1edd77f1a37c/woxuwabivaje.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_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 5604 bytes
SHA-256: 5080004c796c21d0b94907ea41cb405ab2450e4f81c692bf1177b70e95b36e43
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 10332 bytes
SHA-256: bbd7a3adfa767c419dc0ba276545089c8e25290a5a643ab0f511e6f974aa0e20