Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fb7ad962f02b44…

MALICIOUS

PDF

86.4 KB Created: 2021-06-02 06:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 066186b5796869297c9508e9fabb4ae4 SHA-1: ef6715c3827247938206a2ffd5cc5f6996d5d79d SHA-256: 10fb7ad962f02b443557f5d4180e816ee35aa1fd88d2480b9e5fa1f4a731ff13
176 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of malicious activity, including malformed streams and a high ML classifier score, consistent with phishing or SEO manipulation. It contains numerous external links, with one pointing to 'https://huntic.ru/pbw?utm_term=how+to+evolve+riolu+brick+bronze', suggesting a lure to external content. The presence of multiple PDF links further indicates a potential link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://huntic.ru/pbw?utm_term=how+to+evolve+riolu+brick+bronze PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384835/normal_600de04b83ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5fdc481fb32e8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412575/normal_60b1fb94e91e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5ffc816f5887a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_5fd33ab6eabb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_60485f76bd4fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390659/normal_5fe0b6bc63e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_60446c92ae84b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4372104/normal_60b00d7be7ad8.pdfIn PDF document text
    • https://vogovolakufa.weebly.com/uploads/1/3/4/8/134874318/142b99209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_6064222d55abc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_604edfa7cf8d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_5fda47794d6e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_6054c8d69dcc2.pdfIn PDF document text
    • https://foworagajiwodim.weebly.com/uploads/1/3/0/9/130969946/rujeruvobawabufitad.pdfIn PDF document text
    • https://nodeseverew.weebly.com/uploads/1/3/5/3/135323512/fovusivewesoko-luzesufokenopa-pokakakuxibiwuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_60698a7b67b75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_60446a7ecce18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_6059fc5f80507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_6039caf62c216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453909/normal_5fecd3453b2fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 3376 bytes
SHA-256: c9ca6ad890612250fd8f432d71aba6ed11f57010281fb51d579c47c082bb16ac
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 4652 bytes
SHA-256: cf88f79b3477eabaee03a22376f0f816b87ada54423770fad0339da084e20168
font_02_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 11912 bytes
SHA-256: 532a4967fbcd26691a11d2a9da84504f54b8bf51b363888681b3c83aa66ed0d1
font_03_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 16060 bytes
SHA-256: bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d
font_04_sfnt_off00013b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378