Malicious PDF — malware analysis report

Static analysis result for SHA-256 12025eb407db66f2…

MALICIOUS

PDF

80.2 KB Created: 2021-02-27 09:12:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ef56f2f4997120a41e2960572ec7b35d SHA-1: 458ae27135fa5962e52fd728549f4ae504dc1e6d SHA-256: 12025eb407db66f2b4aff10acbc1d05bfef07784230897ad78c37e735402a5a8
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for redirecting to known malicious infrastructure. The document contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wb?keyword=slope%20from%20a%20table%20worksheet%20pdf In PDF document text
    • http://katipef.medianewsonline.com/what_is_introduction_to_philosophy.pdfIn PDF document text
    • http://lidlid.xyz/roxuneznc1jd.pdfIn PDF document text
    • http://segway-wheelchair.ru/49703866205b4d3w.pdfIn PDF document text
    • http://cozyplacefor.rest/softonic_avg_gratiso6ths.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/cisco_sg200-50_console_port.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459062/normal_5fc91a054c669.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/stress_concentration_factor_kt_formula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381544/normal_5ffdb66bc8f56.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/tinizedubenajoridalitu.pdfIn PDF document text
    • https://jabesukugadipo.weebly.com/uploads/1/3/2/8/132814964/tegezexesonedevabiw.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/donarepemi/borg_warner_velvet_drive_71c_rebuild.pdfIn PDF document text
    • http://fokogemuzaraw.epizy.com/fosanelu.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/82198472336.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 6440 bytes
SHA-256: c8a57be3ecf27910436cd3aa3c4dc4e27da9663d19ac26e136dd904337c32bcc
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 5680 bytes
SHA-256: 1ceccab27f830db301d0e8c8ffaddc020d1377463b5f2ca8cf01e20623db028b
font_02_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 11360 bytes
SHA-256: 50de207ceaac1e7cc28086f607d4b6765bf6defa2a392ed13e8e12e7f116b09e

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