Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de57bb2c62f9bb6…

MALICIOUS

PDF

81.4 KB Created: 2021-05-31 12:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2114171112556e17f7e2c5d7dab4b98e SHA-1: daf9b1653353109b9c6d1e780b9e7b25c9600672 SHA-256: 1de57bb2c62f9bb612dfe1990f77fab6d7922e8a694aba25e17a280bb17dab3b
156 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically by presenting itself as a source for 'free android downloads'. The presence of a large number of external links, identified as a link farm, suggests an attempt to direct users to potentially malicious websites. The ClamAV detection and ML classifier output strongly indicate malicious intent, likely to distribute further malware or conduct phishing operations.

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-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://ponafet.ru/strik?utm_term=free+android+downloads
    • https://cdn-cms.f-static.net/uploads/4462065/normal_602b59d5b433c.pdf
    • https://static.s123-cdn-static.com/uploads/4489601/normal_5fed9c542d277.pdf
    • https://cdn-cms.f-static.net/uploads/4379626/normal_603e8541058a3.pdf
    • https://cdn-cms.f-static.net/uploads/4447658/normal_6029523d0eb2c.pdf
    • https://static.s123-cdn-static.com/uploads/4448110/normal_5fe4c4695ca91.pdf
    • https://cdn-cms.f-static.net/uploads/4417830/normal_60388b5ba8f66.pdf
    • https://static.s123-cdn-static.com/uploads/4387918/normal_5fcc5563d308f.pdf
    • https://rapekazojeroxe.weebly.com/uploads/1/3/4/6/134697974/zoziwav_wirigoxafem_fubifobesobo_fupog.pdf
    • https://cdn-cms.f-static.net/uploads/4502511/normal_60661e1bb730f.pdf
    • https://cdn-cms.f-static.net/uploads/4402261/normal_60586cc0621cd.pdf
    • https://cdn-cms.f-static.net/uploads/4403817/normal_6026fa697bcec.pdf
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/xabuwef.pdf
    • https://cdn-cms.f-static.net/uploads/4476601/normal_6054865ce6152.pdf
    • https://static.s123-cdn-static.com/uploads/4502188/normal_5ff64e2120fde.pdf
    • https://static.s123-cdn-static-d.com/uploads/4367302/normal_60b2b607d78ad.pdf
    • https://cdn-cms.f-static.net/uploads/4489852/normal_6011bb958e9df.pdf
    • https://static.s123-cdn-static.com/uploads/4495707/normal_60016dcc2d564.pdf
    • https://vodunifowabot.weebly.com/uploads/1/3/5/9/135992931/bawijitiwup-xenulizute.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ea54.bin
35f37b9a6c044f602b20b72ec96ee61602480c2ed251055315e4dedd5686d134		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 4868 bytes
font_01_sfnt_off0000fafe.bin
5a1c2ad8fca9c9daeed8d9f2a6ef1cc5e212bfa7008359e69e06af940fb83580		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 11556 bytes
font_02_sfnt_off000122c9.bin
ccdabcffa62005b18d0c1c71c806e3ffc5051b37a93cc716e154d6898f761ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 16260 bytes

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