Malicious PDF — malware analysis report

Static analysis result for SHA-256 049318515ce1e329…

MALICIOUS

PDF

77.5 KB Created: 2021-05-26 19:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c0a027e263edcd94391d825d2f92b30 SHA-1: 506f4b11fbb2ffc9f2f5284ee5b0cf75b93702d0 SHA-256: 049318515ce1e3290d35d20212d95721e6c241ee42f8c92b677482f8d851babc
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of the primary external URIs observed is 'https://xezojetit.ru/strik?utm_term=lazy+loading+in+android+recyclerview+example+github'. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized PDF. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=lazy+loading+in+android+recyclerview+example+github
    • https://cdn-cms.f-static.net/uploads/4403130/normal_60275aa38d190.pdf
    • https://cdn-cms.f-static.net/uploads/4380229/normal_602995c73e590.pdf
    • https://cdn-cms.f-static.net/uploads/4411917/normal_603142cadc8dc.pdf
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fde795eaf58d.pdf
    • https://static.s123-cdn-static.com/uploads/4450257/normal_600236b86dffc.pdf
    • https://vofoxefak.weebly.com/uploads/1/3/4/6/134645633/a083eafa.pdf
    • https://lemuvizavo.weebly.com/uploads/1/3/2/6/132682731/wedaxagivok.pdf
    • https://cdn-cms.f-static.net/uploads/4415748/normal_604e95167dad4.pdf
    • https://cdn-cms.f-static.net/uploads/4426972/normal_604497667924e.pdf
    • https://cdn-cms.f-static.net/uploads/4448551/normal_5fd88f2a3e474.pdf
    • https://cdn-cms.f-static.net/uploads/4470014/normal_60637f5510404.pdf
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5fcc92e21ecb2.pdf
    • https://cdn-cms.f-static.net/uploads/4451954/normal_606e25e9677da.pdf
    • https://static.s123-cdn-static.com/uploads/4446038/normal_5fcb7547b0828.pdf
    • https://cdn-cms.f-static.net/uploads/4476756/normal_604e6d6b3d874.pdf
    • https://cdn-cms.f-static.net/uploads/4449183/normal_60106a77a9bf5.pdf
    • https://cdn-cms.f-static.net/uploads/4454824/normal_6055b73fd644d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ddd0758-9188-4433-98bf-49b0eca5792c/ikea_malm_bed_replacement_parts.pdf
    • https://uploads.strikinglycdn.com/files/9fefb363-7453-4f06-91ce-147c1f8644c3/sifigudiv.pdf
    • https://uploads.strikinglycdn.com/files/cfedabba-b6fb-4383-ae74-6a52aa429f10/percy_jackson_sea_of_monsters_2013_full_movie_tamil_dubbed.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_off0000e27a.bin
040f9603be6cf51f5caf4523dcb1dd40e9d9fe6479dc76fdb24d9bb5e2f95771
pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 5760 bytes
font_01_sfnt_off0000f60d.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 1800 bytes
font_02_sfnt_off0000fe9b.bin
28385247ea7cb8fa0195387b5e63f68a5292b87d0e29faa22cfdf86319de1dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 11616 bytes