Malicious PDF — malware analysis report

Static analysis result for SHA-256 4761c85f576f440e…

MALICIOUS

PDF

78.6 KB Created: 2021-05-23 02:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1410144100638bcbf2cb832a9bf54e4d SHA-1: b33c9330308b832b0594e437cf70b44498a93de3 SHA-256: 4761c85f576f440e8e2a0fdbba69916d2e55c827e00b0e31299cd5ae8212b1f1
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to 'resalured.ru', which is suspicious. The ClamAV detection and ML classifier also flag this PDF as malicious, likely a phishing or trojan variant. No scripts were extracted, but the structure suggests an attempt to manipulate search engine results or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/wb?keyword=karcher%20k2%20pressure%20washer%20leaking%20from%20bottom
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5ff80785ed610.pdf
    • https://cdn-cms.f-static.net/uploads/4408594/normal_6059307802729.pdf
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fd1fdd6be015.pdf
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/nipufi_duduparujeteruz.pdf
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/momunuv_zaxebab_rulorejibi_mevalodiwun.pdf
    • https://nozudepoget.weebly.com/uploads/1/3/1/1/131163917/vowozadimusojed_suvamaj.pdf
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/2b1596bf10.pdf
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fd6632261645.pdf
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5fe6c898b16a6.pdf
    • https://cdn-cms.f-static.net/uploads/4473030/normal_603e83125a4dd.pdf
    • https://bevufifebuseve.weebly.com/uploads/1/3/1/8/131855995/b359d22.pdf
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/d6f3996666f.pdf
    • https://cdn-cms.f-static.net/uploads/4490272/normal_602aea056142b.pdf
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/5351322.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6468a9d5-00a2-437a-a98e-67469ea1214b/lenazewedolarulibilex.pdf
    • https://uploads.strikinglycdn.com/files/89c17249-aa83-4d62-92e1-ae2a0c5a5423/child_of_god_meaning.pdf
    • https://s3.amazonaws.com/tobobowu/moriloj.pdf
    • https://uploads.strikinglycdn.com/files/9ea2a226-4f91-4c3d-a0c5-f3d37de07609/types_of_text_reflecting_different_cultures.pdf
    • https://s3.amazonaws.com/bulikowexunepov/weganekovejazinomepop.pdf
    • https://s3.amazonaws.com/boduxatavepe/1996_yamaha_timberwolf_250_rear_differential.pdf
    • https://s3.amazonaws.com/povodijirig/spark_brigid_kemmerer.pdf
    • https://uploads.strikinglycdn.com/files/fe2cbfa2-c941-40a5-abb6-2bdbbc0990d3/56345791977.pdf
    • https://uploads.strikinglycdn.com/files/f6c135c2-4540-4bb1-97ad-bf21a3e9efb2/the_hound_of_the_baskervilles_chapter_1-3_summary.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_off0000e73b.bin
afd8a06708c958db3fa76fc047fc21b7b9c40394511957599e5cf159e56df517
pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 5708 bytes
font_01_sfnt_off0000fa8f.bin
049e8a3b0301099640d85a8e49db8f0957fef4be503d045fdd532b64f0bde1f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10728 bytes
font_02_sfnt_off00011ec3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 4324 bytes