Malicious PDF — malware analysis report

Static analysis result for SHA-256 21008663fe5aae9e…

MALICIOUS

PDF

80.1 KB Created: 2021-03-25 02:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7433a0168c3d9fd43281c2d099e5e24 SHA-1: 783301fe83a3b45745f58617d443f874260b32a7 SHA-256: 21008663fe5aae9ecb5cf80f417ea5afe6d49172165920910759e974288469dc
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, suggesting it's part of a link farm designed to direct users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be instructing users to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=beep+song+cut+ringtone
    • https://cdn-cms.f-static.net/uploads/4415946/normal_604566557a9f4.pdf
    • https://detubutil.weebly.com/uploads/1/3/5/3/135348338/cec937004f1.pdf
    • https://static.s123-cdn-static.com/uploads/4421969/normal_5fe575c2f01c6.pdf
    • http://satogolijosefas.iblogger.org/incurred_but_not_reported_insurance_example.pdf
    • https://nozezezolakufu.weebly.com/uploads/1/3/2/6/132695232/patoxosevawodofo.pdf
    • https://vavivaso.weebly.com/uploads/1/3/0/8/130873957/vizalisu.pdf
    • https://cdn-cms.f-static.net/uploads/4405639/normal_603428bb558bc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sesafefanulokam/36190698510.pdf
    • http://pinisexukatata.rf.gd/82861781645.pdf
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_4f3e190c099948e089b3fd4e79f452f8.pdf?index=true
    • https://s3.amazonaws.com/datarofapakil/xotam.pdf
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_c53a62f72c974c41b9682216f84f0811.pdf?index=true
    • http://busugotuwege.epizy.com/brown_university_logo.pdf
    • https://s3.amazonaws.com/makumapikeze/gabus.pdf
    • https://s3.amazonaws.com/muvarelo/26227083999.pdf
    • http://kexasejuwodeji.epizy.com/wufiwesaxikajilidexonajex.pdf
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_5e0f158f04b44a6995730bafbc639222.pdf?index=true
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_17fa0c261dc54d86bd89b27aac66cd2a.pdf?index=true
    • https://s3.amazonaws.com/waxegatulo/rhyming_words_for_freeze.pdf
    • http://vimitafukufes.rf.gd/49361373.pdf
    • https://ad646471-8556-449a-8150-55a6f6ff724f.filesusr.com/ugd/7a1c5b_922c277aacb348eb862bba2df779629c.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe65.bin
ab081a5a607713ca4bca50efe019621d0eb5814e54d64cad1e5a631634409791		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 4908 bytes
font_01_sfnt_off00010f33.bin
550b3a69084578193f85b6279c6a607a5d4ef281fa4108f1ffe12f8cfe8bf649		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 10636 bytes

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