Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dae523c8ebe3ad…

MALICIOUS

PDF

78.8 KB Created: 2021-06-07 23:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e0587e62c1052c67c2d143c9b8cbd10 SHA-1: e1739a36f4d774b3bc084f42bb44181403c7d5b2 SHA-256: 51dae523c8ebe3adac5e7c0d6df2eaf17f4adecd3468c57f539312822ec39562
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classification and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://drafthe.ru/pbw?utm_term=literary+devices+in+harrison+bergeron', is particularly suspicious and likely leads to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://drafthe.ru/pbw?utm_term=literary+devices+in+harrison+bergeron
    • https://kunetofuwuwe.weebly.com/uploads/1/3/4/3/134373833/nivefad.pdf
    • https://petesironow.weebly.com/uploads/1/3/4/4/134495836/9541bb6a023cd.pdf
    • https://zufopawel.weebly.com/uploads/1/3/4/4/134462865/2879483.pdf
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/2fd014792dff9.pdf
    • https://nepigisebax.weebly.com/uploads/1/3/4/4/134477897/raketamovu.pdf
    • https://tezolusubugejel.weebly.com/uploads/1/3/5/3/135314563/7272158.pdf
    • https://mokoxofedig.weebly.com/uploads/1/3/4/8/134891763/kizelazeru.pdf
    • https://godusepes.weebly.com/uploads/1/3/4/8/134899552/4753199.pdf
    • https://mifadumuvuvog.weebly.com/uploads/1/3/4/6/134689338/c20a73.pdf
    • https://sujuwamor.weebly.com/uploads/1/3/4/7/134719544/8957538.pdf
    • https://nesaresivegixan.weebly.com/uploads/1/3/1/4/131453215/fogamiwigude.pdf
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/58930579559fb.pdf
    • https://bobuvuxatuf.weebly.com/uploads/1/3/7/5/137519798/5710145.pdf
    • https://wonulabanasilod.weebly.com/uploads/1/3/1/4/131482851/nonefefowifumebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zexowisam.pbworks.com/w/file/fetch/144755334/24118792794.pdf
    • http://tusoxefum.pbworks.com/w/file/fetch/144721467/why_do_my_kittens_poop_smell_so_bad.pdf
    • http://pevozowo.pbworks.com/f/how_to_choose_contraceptive_pills.pdf
    • https://uploads.strikinglycdn.com/files/c56c3967-0552-4d8b-836f-43929494363d/84941688200.pdf
    • https://uploads.strikinglycdn.com/files/f3ca39ee-b4a0-4f8f-a888-cba8664cb9f5/siddhi_lakshmi_stotram_lyrics_in_kannada.pdf
    • http://vananizi.pbworks.com/f/65449981655.pdf
    • https://uploads.strikinglycdn.com/files/ab613005-e134-44ca-bcd7-d83e94379965/781445131.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec78.bin
b16222d3a57600da9e33ff2f9d5e78e33ee56afccaac8b044e13833826aaaf40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 5200 bytes
font_01_sfnt_off0000fe24.bin
70d037203ea1b8e54e58bba45e3926edf8402b076ba9adb1d6053e4337dd0bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 10028 bytes
font_02_sfnt_off00011ff7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 4324 bytes

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