Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d63462c228079f1…

MALICIOUS

PDF

78.5 KB Created: 2021-03-08 09:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a1bb31194e33a3645c061b886403c5d1 SHA-1: 946a20996122b3c834f717ead99b55aecd258bcc SHA-256: 4d63462c228079f1dacc1ecee82cab4af78845e1a2a9ba43703f538b1f3de347
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to a book summary, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=all+the+bright+places+summary+no+spoilers PDF link annotation
    • http://bigwin-1xbet.fun/world_at_arms_hack_apk_4._2._4d0dvmm.pdfIn PDF document text
    • https://satalediveli.weebly.com/uploads/1/3/4/0/134018026/pisaz.pdfIn PDF document text
    • http://obzorov.site/33699791254zvs6w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5fd2d0d80f2ed.pdfIn PDF document text
    • https://xatoxelal.weebly.com/uploads/1/3/1/4/131482937/7a65bb8297ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462035/normal_5fdcfb1d06663.pdfIn PDF document text
    • http://fusobilel.iblogger.org/futegogare.pdfIn PDF document text
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/6429281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_600bf0d9a7aa2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd684009-b7cb-491d-a598-e1c94e483aac/netibiwaredajuvogevel.pdfIn PDF document text
    • http://bosulug.epizy.com/xekiganosuwufonukix.pdfIn PDF document text
    • http://vipebajivakal.epizy.com/brinks_security_light_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797621a0-0ae5-4f6d-94e2-e4e365e6e385/northern_ireland_postcode_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd6c5b1-0441-4e33-8051-9b507e8cbbe6/kalifenusozoniribesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4082f748-377a-4cf3-8ab7-00be3df93fcc/plantronics_voyager_legend__case_bt-hs_bluetooth_headset_schwarz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc6581f-d24f-40b7-90fa-630c71e5ba97/buwupirikesobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0881b5a-fa9c-4668-84b8-8dae86622edd/japan_sap_users_group_utd.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 5576 bytes
SHA-256: b71de3389b3af7e1925507dea09e72e790c710471c8a3410542fd4c82c3aef31
font_01_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 11204 bytes
SHA-256: 32a55d6dc71dab2182ac2467c6669ce3fc5141bfb266855fdf5e7b95716705e7

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