Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2d97cd6b7ee43f…

MALICIOUS

PDF

88.3 KB Created: 2021-05-23 17:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b77a13d3927bd0972b6c6bf44daeb19b SHA-1: d6858eca69e4788220d4d5d6938a0dcfbbdf4e6a SHA-256: ca2d97cd6b7ee43f0a890238e3dc219d7b899fd985ca966f45595cc8529ee7f9
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farming or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of providing a password to decrypt a subsequent payload, further supporting a malicious download or phishing scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://midufefew.ru/strik?utm_term=jerarqu%25C3%25ADa+de+operaciones+con+par%25C3%25A9ntesis+ejemplos+resueltos
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/januxusowoxir.pdf
    • https://static.s123-cdn-static.com/uploads/4390057/normal_5ff56bec5f4ea.pdf
    • https://static.s123-cdn-static.com/uploads/4530868/normal_60070d6d05205.pdf
    • https://static.s123-cdn-static.com/uploads/4470521/normal_60096ca2a83dd.pdf
    • https://cdn-cms.f-static.net/uploads/4410983/normal_600a82067c7f7.pdf
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/97246198.pdf
    • https://cdn-cms.f-static.net/uploads/4460048/normal_606c4b3bf08b9.pdf
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/6af09f489.pdf
    • https://cdn-cms.f-static.net/uploads/4530990/normal_6034cefecc0ea.pdf
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/kavibuliteka.pdf
    • https://cdn-cms.f-static.net/uploads/4368237/normal_604791ff3abc7.pdf
    • https://cdn-cms.f-static.net/uploads/4497687/normal_600d638b06cdc.pdf
    • https://cdn-cms.f-static.net/uploads/4377410/normal_602eb46d8b970.pdf
    • https://cdn-cms.f-static.net/uploads/4464315/normal_605c9cb751d74.pdf
    • https://cdn-cms.f-static.net/uploads/4388048/normal_6038166f127a2.pdf
    • https://cdn-cms.f-static.net/uploads/4408319/normal_6064558b35159.pdf
    • https://cdn-cms.f-static.net/uploads/4463812/normal_5fd34c7c22394.pdf
    • https://cdn-cms.f-static.net/uploads/4393779/normal_604bbb6c31f79.pdf
    • https://static.s123-cdn-static.com/uploads/4379961/normal_5ffd47248f813.pdf
    • https://cdn-cms.f-static.net/uploads/4376878/normal_600da4cf64d2d.pdf
    • https://cdn-cms.f-static.net/uploads/4479446/normal_603dad53779a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9029b9cc-a6a9-4834-884d-b72ebade9a4b/narujakem.pdf
    • https://uploads.strikinglycdn.com/files/27c2e69d-f73c-4deb-b5f8-df3fc2ae91aa/zegamiditowuz.pdf
    • https://uploads.strikinglycdn.com/files/d4235e65-ae5e-43a3-8c64-4a168df1c054/63960202277.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff5a.bin
5dc94c71fabd675d671056022cf56d2e41e826a28c9ab625df89bd217653496a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 5608 bytes
font_01_sfnt_off0001120d.bin
d0807a28be21cda148e313a73ff272c4a14ff84754b5bc840d4d76f8acbc8523		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 12232 bytes
font_02_sfnt_off00013a93.bin
3838803e681e4e14687336194d281ecefccde1601e6cfb3e627b28148e87fa8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A93 16308 bytes

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