Malicious PDF — malware analysis report

Static analysis result for SHA-256 da23f9730ec446f3…

MALICIOUS

PDF

93.4 KB Created: 2021-04-01 00:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d30e4f0465a510450cdfdc8ecea1440f SHA-1: c4d2f657301a76548095d3f206e7ae7c6a2a1564 SHA-256: da23f9730ec446f3592de6d5792d84038c30d936e68a0a65e90fbdc9d8891598
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external sites, with one specific URL being flagged as malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack to drive traffic to a malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=bare+bones+a+survey+of+forensic+anthropology+2nd+edition+pdf
    • http://axecheat5.xyz/62975622658adfv2.pdf
    • http://jofarofuwudeveb.66ghz.com/36273778917.pdf
    • http://winoraama.fun/disney_itinerary_template7zpeu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xulepiwa/69347345202.pdf
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_07fc9b16dd7c40b8b0d96a21fd890bcc.pdf?index=true
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_b9993a4d4e2c45f3ab59f6c1dd3ffc49.pdf?index=true
    • https://s3.amazonaws.com/zatasipezeg/96568527141.pdf
    • http://dumavibir.rf.gd/teguramesupefu.pdf
    • http://posunozagexug.epizy.com/kugemisujosorarobuxa.pdf
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_0fc7c552fc6b451bb9c71137c31ce325.pdf?index=true
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_84b515a37022433b8be4079eb9056629.pdf?index=true
    • https://uploads.strikinglycdn.com/files/12258539-bcef-4ec1-b340-b98d17a87dd3/10_ways_to_appear_smart_in_meetings_sarah_cooper.pdf
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_d86b9378438f4a3bb05f9939c2a07def.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a8153ee-5377-42a3-8b75-ec4a88040292/xobixubupisajum.pdf
    • https://uploads.strikinglycdn.com/files/cdd009be-010d-4161-a1e2-71819c39cff4/72496642840.pdf
    • https://s3.amazonaws.com/zuponefi/xatuwakef.pdf
    • http://beninoduvewer.epizy.com/bluetooth_drivers_for_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/f10fa701-c577-4b56-bd5f-272e6d4c1bab/sea_ray_180_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/d50a03ff-7f52-4e45-8c16-b483275a5c84/98645723041.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
    • 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_off00011607.bin
a88126a060813a07099435889d97b475b0d49f0499d3dc4c5d045cd7e0dfbf94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 5900 bytes
font_01_sfnt_off00012a25.bin
6d91325f3a24fc401fdc03c637867865e5fec53fb7e773e09eb3e9f2dcc0d74d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A25 11920 bytes
font_02_sfnt_off000152ea.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152EA 16060 bytes

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