Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a857514b0e1d060…

MALICIOUS

PDF

92.1 KB Created: 2021-03-21 11:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2227b3034a40e315ab7170961caacde5 SHA-1: ae615a17e139b83ccc17011eee858bd22cfb97e4 SHA-256: 2a857514b0e1d060f4e9c8e553f04182f1bdaad2238dee9ba9423e9cd5834716
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=chapter+12+chemical+bonding+answers PDF link annotation
    • https://cdn.sqhk.co/tipefimex/jeicYjf/k_yamet_kombat_arena_hile_2018.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/shadowrun_2nd_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481820/normal_6006d3c4625fb.pdfIn PDF document text
    • https://cdn.sqhk.co/jilazelitor/Djajchf/barewoxadoweluk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_6053a417d2e95.pdfIn PDF document text
    • https://cdn.sqhk.co/dejowipapoli/i4IjhkN/82001933391.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/hdicrPx/slime_backgrounds_for_phones.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494436/normal_6008eda48318a.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/common_french_expressions_idioms.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/Xjjjdih/80038130196.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/hdthjih/easy_wallet_nfc_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/gjigDji/xagob.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/55947cfc-2d54-4e31-bbc1-4707287378da/how_many_amps_does_a_typical_refrigerator_use.pdfIn PDF document text
    • http://rikaxusajojoba.epizy.com/jonefebowiwosotugebikuro.pdfIn PDF document text
    • http://didaduxazej.epizy.com/distinguish_between_heterochromatin_and_euchromatin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a004ee08-fe41-493e-9e3a-ac207e74738f/dark_souls_remastered_wiki_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e02e210-53b6-4f54-a9a2-a7ef68569392/nerotimoju.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_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 5808 bytes
SHA-256: 52ca45766d296e682f7db7224194ac28a74b660c3b35765ae861b81f6922771d
font_01_sfnt_off00013c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C04 11856 bytes
SHA-256: 53a6381dfa6db5e586fcbd0a808727b456d94c879b8def7e9109581fc4e2c9f5

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