Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d2af1c02d71f52…

MALICIOUS

PDF

76.7 KB Created: 2021-01-10 03:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9d1df433e259a6cb8105250657df4398 SHA-1: 6e6a72be36a44981313de4a7aa68cafe9bbf0509 SHA-256: b1d2af1c02d71f52cdd9aaed4d6e5f3c9a0cac14a17955a29ac3f60391ba987b
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and link farms hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam campaigns. No scripts were extracted, but the document's structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=muse+web+design+software In PDF document text
    • https://site-1167950.mozfiles.com/files/1167950/pixel_buds_case_replacement.pdfIn PDF document text
    • https://site-1221793.mozfiles.com/files/1221793/samsung_pay_verify_card_sms_not_working.pdfIn PDF document text
    • https://tebemixaziwig.weebly.com/uploads/1/3/4/8/134889210/xedisunekune_zuzumelujutajom_pusakegotiseri_meripo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_5fbc853cd9584.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/hayVjcq/88213295276.pdfIn PDF document text
    • https://wexipemeb.weebly.com/uploads/1/3/4/8/134860193/wewoma_fizitise_vageladenukol_rapon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f990d3295fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_5fdc17530b43a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f9af34fcbc32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5fc8b79515ddd.pdfIn PDF document text
    • https://pepusaneped.weebly.com/uploads/1/3/4/5/134503703/gotegi-bagexewukujok-sefotamejedujov.pdfIn PDF document text
    • https://lazekikobetilof.weebly.com/uploads/1/3/4/4/134443651/jeranazitukumed.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/susopuzupure/mefisufepinetave.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/76413616882.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_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 5280 bytes
SHA-256: c80d8929eaedb5df47a918c357c01bc382062a26ab71f2c3fe429f7eddd64668
font_01_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 10900 bytes
SHA-256: 76e023d310daa4c5e6d519ed580894574eef4934491e58ca131b43267e06772c

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