Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08389ab0b5d853f…

MALICIOUS

PDF

122.7 KB Created: 2021-03-19 14:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d1cea3b249fb9c58ac8a57863eba609 SHA-1: a7997ccafb5cbbc7e9f838911e043dab1048cd51 SHA-256: a08389ab0b5d853f3c450d7d22a0cba41eaafa3ec6a376992928935c5ebf5f10
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains keywords related to hacking game accounts, aligning with the PDF_SEO_LINK_FARM and PDF_URI heuristics. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=how+to+hack+hay+day+for+money
    • https://fiwigerisen.weebly.com/uploads/1/3/1/4/131408459/92c86bf0f3.pdf
    • https://rofujerejikuf.weebly.com/uploads/1/3/5/3/135388349/14ff2b.pdf
    • https://togajakuro.weebly.com/uploads/1/3/1/4/131409127/8700513.pdf
    • https://nusuwexob.weebly.com/uploads/1/3/4/3/134352417/dd3528a788a3a5.pdf
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5ff29e86315a5.pdf
    • https://lorudopop.weebly.com/uploads/1/3/4/3/134315835/eebbad1370ffa.pdf
    • https://cdn-cms.f-static.net/uploads/4409239/normal_602903a8814ae.pdf
    • https://cdn-cms.f-static.net/uploads/4463266/normal_6049cac124998.pdf
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/ruwaxalisebu-tafibifuwazoxek.pdf
    • https://zibiwatogotoz.weebly.com/uploads/1/3/1/1/131163514/xufanurama_gasaxuwa.pdf
    • https://dujuwugad.weebly.com/uploads/1/3/4/7/134721680/fukovupotalepuv.pdf
    • https://lilufegat.weebly.com/uploads/1/3/5/9/135965666/4523478.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wivunonovef/lentiform_nucleus_location.pdf
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_f425e9905bda47c2a1eefcef56edf76b.pdf?index=true
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_dc39559aadba447c90c647cf3b37229e.pdf?index=true
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_d8500227ad8347ee83a3ac9bfd605985.pdf?index=true
    • http://pijularof.epizy.com/9x_movies_2018_hollywood.pdf
    • https://s3.amazonaws.com/fapaga/write_a_short_paragraph_about_your_pet_animal.pdf
    • http://revobisamapekuz.epizy.com/70198150989.pdf
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_9a476e61972847068d9512ef651b1602.pdf?index=true
    • https://s3.amazonaws.com/polojuliragam/ragnarok_eternal_love_guide_crusader.pdf
    • https://s3.amazonaws.com/lazesej/jezadiwuxiwexunep.pdf
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_097a7b9a3a33479f9b5b56ea07bd982b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a0de.bin
41fce23822a74d3a04d57ca8de07d5e386f91cda5f830d75992af4b730419fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0DE 5272 bytes
font_01_sfnt_off0001b2b8.bin
fd179fe3760681df97e0f71e8c9053a0dbc9b61fdb53c000595c46b1bd706ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2B8 11808 bytes

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