Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf951b080b2553b1…

MALICIOUS

PDF

76.9 KB Created: 2021-03-19 01:24:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 10ab1f0b80323da35a9b3be5a2d3931e SHA-1: 73972495b5979e513fbd36c6eb516f4f37191648 SHA-256: bf951b080b2553b1b7ba8cb152796b71b32ad30cca67686f037d8b42bfdb38d9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://soxebez.ru/award?keyword=adhd+self+test+for+adults+pdf PDF link annotation
    • http://flathead.us/sharkrf_openspot_3_review7chif.pdfIn PDF document text
    • http://haustova.com/674226102435gre8.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/ihajdic/aaa_roadside_assistance_plans.pdfIn PDF document text
    • http://help-mediasupport.com/aha_acc_valvular_heart_disease_guidelinescfpr3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_5fd22dd08e89d.pdfIn PDF document text
    • https://cdn.sqhk.co/wukatigubo/vjgzkie/garlic_smashed_potatoes_crispy.pdfIn PDF document text
    • https://cdn.sqhk.co/loboremetoxe/if70LV5/95075267352.pdfIn PDF document text
    • https://damusabuweko.weebly.com/uploads/1/3/4/6/134609075/3187921.pdfIn PDF document text
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/8b87fdc8.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/jhh8mqr/funny_gifts_for_girlfriend.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_6049cf20ef4aa.pdfIn PDF document text
    • https://cdn.sqhk.co/siwebove/jogfhdc/royal_farms_arena_monthly_parking.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/megelugik/zagagifawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d832ab-6c66-47b9-9e52-50a497017a8f/american_red_cross_blood_donation_center_zeier_road_madison_wi.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/interview_guide_sample_qualitative_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03be3310-302b-4099-a052-003bdce6fe42/bujamuzupovemibagoponife.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/81135829941.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_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 5120 bytes
SHA-256: 8560873322eba0033c976d7a09b90b1cffb0482e90d2d8a551764a5b18f4a6ba
font_01_sfnt_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 10844 bytes
SHA-256: 519d2b9874a1441ec21501197d8f5798322283cdd104bdadef77f742f08dcb66

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