Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b9c08ba623d6ad…

MALICIOUS

PDF

77.4 KB Created: 2021-04-07 22:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42116196982b96427e9f2dcaa6887c7b SHA-1: 74462c51c466263928e7b689405c75e6db7cfdea SHA-256: 67b9c08ba623d6ad1ff0ad52ba2eb089f766c48bf8c31a53e6a9cdefaa2855fc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. One prominent URL, 'https://resalured.ru/123?utm_term=ola+cabs+app++chennai', suggests a phishing or malware distribution lure related to ride-sharing services. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=ola+cabs+app++chennai
    • https://cdn-cms.f-static.net/uploads/4459034/normal_60543f7a6717b.pdf
    • https://cdn-cms.f-static.net/uploads/4493209/normal_602bfbf55b7f3.pdf
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/1763164.pdf
    • http://bilkan.fun/kopigagibazupukuxi1xway.pdf
    • https://cdn-cms.f-static.net/uploads/4405945/normal_603507b11e671.pdf
    • https://static.s123-cdn-static.com/uploads/4485576/normal_5ffe0016bb8a9.pdf
    • https://lixudovu.weebly.com/uploads/1/3/4/5/134598000/b4a00b82.pdf
    • http://cardio-natural.info/gegitagusalaviwatotebwm2ga.pdf
    • https://cdn-cms.f-static.net/uploads/4416136/normal_5fe63defee6af.pdf
    • https://cdn-cms.f-static.net/uploads/4464542/normal_603e938900869.pdf
    • https://lozofuxoxezutuw.weebly.com/uploads/1/3/5/3/135303337/dizine-fiwamaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/110e7f5d-3110-4841-8bd5-3f44b4c7aa81/21714565748.pdf
    • https://s3.amazonaws.com/fosalizuzu/90625550446.pdf
    • https://uploads.strikinglycdn.com/files/a24ab0dd-3b9c-46e1-8d35-9bba79c74f74/the_book_of_beasts.pdf
    • https://uploads.strikinglycdn.com/files/98e6a0c8-1f75-40d1-b0c7-d4b1b145fd74/can_i_study_in_usa_without_sat.pdf
    • https://uploads.strikinglycdn.com/files/689d6a98-01fd-484e-8afe-374918d2881e/wevatezumew.pdf
    • https://s3.amazonaws.com/ladojenefe/nikon_ml-l3_wireless_remote_control_d3300.pdf
    • https://uploads.strikinglycdn.com/files/6594366c-f4a9-45b4-a0d9-0693a61c1271/werug.pdf
    • https://s3.amazonaws.com/tixedujegibex/using_conjunctions_worksheet_year_3.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_off0000e548.bin
940fc148f305439f187482a5b6ea3db9c450fea0e13dbfa89afb0d7a0d56e678		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 4688 bytes
font_01_sfnt_off0000f519.bin
31d36608f888c88f2569b4fc69e38b506413555d5f993da9d085776655b4f61a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 11000 bytes
font_02_sfnt_off00011a61.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 4324 bytes

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