Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13aee30f296517c…

MALICIOUS

PDF

88.8 KB Created: 2021-03-25 16:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06bb49847b023c3d7948d3639d4ed13f SHA-1: 53ade94d79b9d8f744af181b981646482aadb861 SHA-256: e13aee30f296517c180002250c159fa898095a202b3e28a1903a7c98d9d5524a
156 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that directs users to a website disguised as a search result for a workbook. This technique is commonly used to redirect victims to phishing sites or download further malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/wix?keyword=setting+boundaries+workbook+pdf
    • https://cdn-cms.f-static.net/uploads/4496153/normal_6048f7362c325.pdf
    • https://cdn-cms.f-static.net/uploads/4413712/normal_6050e55e25b2a.pdf
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5fc96199e4da3.pdf
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5fc7392d642ae.pdf
    • https://cdn-cms.f-static.net/uploads/4412584/normal_6059f2884784e.pdf
    • https://static.s123-cdn-static.com/uploads/4464527/normal_60034a6a3ebca.pdf
    • https://tonuvufew.weebly.com/uploads/1/3/1/4/131438708/lopulijajofupuguki.pdf
    • https://static.s123-cdn-static.com/uploads/4482863/normal_5ffa86f2ab05d.pdf
    • https://cdn-cms.f-static.net/uploads/4471249/normal_600fa16431c49.pdf
    • https://cdn-cms.f-static.net/uploads/4407777/normal_5fd84cae90933.pdf
    • https://pitisugokusibim.weebly.com/uploads/1/3/4/4/134445344/8aca341.pdf
    • https://cdn-cms.f-static.net/uploads/4470833/normal_600a29a33fa67.pdf
    • https://cdn-cms.f-static.net/uploads/4391317/normal_601632bdc6ec3.pdf
    • https://cdn-cms.f-static.net/uploads/4487201/normal_5fd31c301d6c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wixatax/roman_numerals_worksheets_for_grade_1.pdf
    • https://s3.amazonaws.com/mavixu/ropoxiwezoxirezaxitazoso.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/adobe_air_android_2._2.pdf
    • https://s3.amazonaws.com/natewared/detosoxaguk.pdf
    • https://s3.amazonaws.com/zoromexemuzid/the_oxford_handbook_of_political_science.pdf
    • https://s3.amazonaws.com/rovikibixu/wosigaxodov.pdf
    • https://s3.amazonaws.com/nawosineromigi/aneurisma_abdominal_sintomas.pdf
    • https://s3.amazonaws.com/makixibawumebol/laminate_countertop_sheets_installation.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_off00010fa0.bin
7c174f3cf1ad255179c0e126fba2692ddf66cd67ef7403677036ffba68feccf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 5456 bytes
font_01_sfnt_off00012245.bin
9b7c2d7eaf9c89a3d4a9287b14cc9331149b38687a7b734aa63cf4cf1528c5af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 11000 bytes
font_02_sfnt_off0001478f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1478F 4324 bytes

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