Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f831fbc1de3ca5…

MALICIOUS

PDF

69.2 KB Created: 2021-02-07 02:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 93713e9d29e2dfa293658b6baa7c0959 SHA-1: 16afa084e1a417dea8d2a2719824d27b2726e64a SHA-256: a0f831fbc1de3ca5594057c1f3052477146d34e93d08957c2da2c25691f51753
156 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'Nhs pension early retirement form', indicating a lure to trick users into clicking on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://baarspo.ru/aws?utm_term=nhs+pension+early+retirement+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413122/normal_5fe2b92d5e7c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406812/normal_6001748699e34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408878/normal_601e6bada4363.pdfIn PDF document text
    • https://fuzedefona.weebly.com/uploads/1/3/4/5/134578490/424353.pdfIn PDF document text
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/lususopegi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481825/normal_5fe287bc7a8d6.pdfIn PDF document text
    • https://zunejafeg.weebly.com/uploads/1/3/4/3/134382709/a815b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fe7921048b7c.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/1dd32058d.pdfIn PDF document text
    • https://lesesagipamagaz.weebly.com/uploads/1/3/0/7/130739561/mubaxevazujom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449000/normal_5feba0afcea3b.pdfIn PDF document text
    • https://mewofotas.weebly.com/uploads/1/3/4/5/134524455/xuzevajepabe.pdfIn PDF document text
    • https://cdn.sqhk.co/nudekikusefi/t9gdzgh/spider_bites_symptoms_in_toddlers.pdfIn PDF document text
    • https://cdn.sqhk.co/pamezuravuno/EgjniaP/cars_for_sale_mn_under_3_000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_5fe83d9aaff76.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/1659313.pdfIn PDF document text
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/1950781.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425917/normal_5fe02896662f8.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/fuwawibu/21669750861.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/13356796429.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/xeferebowuremegajegijud.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_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 5212 bytes
SHA-256: f0d9277d0f8f8c9e0f6569b63a3438dd182d5c1f670fb41a95bb76808422722b
font_01_sfnt_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 10656 bytes
SHA-256: d57b2e1f279fd07fac102f8cef2851d2a0142985913514e379331d30aa3a1c56

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