Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a28524fa8ee4fd…

MALICIOUS

PDF

79.7 KB Created: 2021-02-19 10:33:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d39e3bbf7a6eb8519bdf0bf94b3b2122 SHA-1: df83a376b6e2176416d1b7d0bfcb5f6f2f23a102 SHA-256: 84a28524fa8ee4fdd30192a196a8c5a6ad0f85caa242e0806d19714bc5e2cead
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, flagged as a link farm, and a deceptive title related to 'Cloud9 player salary'. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or SEO spam purposes. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/strik?utm_term=cloud9+player+salary PDF link annotation
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/wemudamu.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/8399116.pdfIn PDF document text
    • https://duxuxapuxud.weebly.com/uploads/1/3/5/3/135332588/lediti.pdfIn PDF document text
    • http://danivufulof.iblogger.org/ripapupapolatuvopona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530036/normal_5fd8bd91713bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_6015bdb748500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_601f92bf7f4a4.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/balesam_novodadexiwadep_xipopagube_tikefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5fd63aa391a99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417670/normal_5fe5018a5a6be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480905/normal_5fceac3671294.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/bexolamabad/buttermilk_texas_sheet_cake_vanilla.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/56215350852.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/16057648284.pdfIn PDF document text
    • http://peleganilijave.rf.gd/punctuation_quiz_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/i_c_d_s_full_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 5116 bytes
SHA-256: f6ed7ef97dcbe94483a5b96092ff220e3cf986a9f9b5a3e55382f8db24c3bfbc
font_01_sfnt_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 1680 bytes
SHA-256: ad8b0158a98297d06690cffa6db8a69147138be217e88ce33b582c31304d2232
font_02_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 11464 bytes
SHA-256: 0c9a62feba3bef1d95efe073df9e0f4f59e492cf9eb5f11b663887f1e1f22e6c
font_03_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 16844 bytes
SHA-256: 5313bdbe4a5bb3b22713f024c351e194f8556c0a8bcc8df274912f7ded49c817

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