Malicious PDF — malware analysis report

Static analysis result for SHA-256 23abdb7ad1e1dd07…

MALICIOUS

PDF

83.0 KB Created: 2021-03-05 11:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9bae7818909bb53d365d3412981b67cc SHA-1: e6bb71390cf788a90ce09a9cbb4c6b73bb51b52a SHA-256: 23abdb7ad1e1dd07e7f374f841a46785edc859ad5e7d80cbbb4b9d2faaeccfcc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/strik?utm_term=what+is+pellon+fusible+interfacing+used+for PDF link annotation
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/6236907.pdfIn PDF document text
    • https://voxalasodakuro.weebly.com/uploads/1/3/4/0/134042561/9260605.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/adVMz2m/996517379.pdfIn PDF document text
    • http://sendgrid-de.com/happy_birthday_wishes_imagespr4ho.pdfIn PDF document text
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/d6419a3dc.pdfIn PDF document text
    • https://zuwiwenulabir.weebly.com/uploads/1/3/1/3/131381762/52aa08034a5b46.pdfIn PDF document text
    • http://mnclassis.org/getizonikukurepizazit0hhf9.pdfIn PDF document text
    • https://gitexapovaje.weebly.com/uploads/1/3/4/4/134464395/1954110.pdfIn PDF document text
    • http://swast-group.website/wofitipevejvp7hy.pdfIn PDF document text
    • https://wizakamulo.weebly.com/uploads/1/3/4/0/134017688/finox-koxemuroj-duridopuwak-mejepo.pdfIn PDF document text
    • https://luwanolukurodo.weebly.com/uploads/1/3/5/3/135397368/2203500.pdfIn PDF document text
    • https://xifilovevovo.weebly.com/uploads/1/3/5/3/135346251/xemibuwumikud.pdfIn PDF document text
    • http://zathkatow.xyz/jeberokapekoniwizaluzokoeibxu.pdfIn PDF document text
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/gasuzopikes.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/gamumafuwoxubukon.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/coiaSxL/41472905655.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/6399123.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/jRlgemf/carrot_peeler_bugs_bunny.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_cfd301b742d44e5aa6a4daba9c8950ec.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_07da6fdec9ec40f9acafc17b29e4c188.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_c3c2d65802ef406fbcfafb48cb5e548c.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_6a99e73b00c94ae1888870bcbb9e0ea2.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_a177d9b2d9304095aa51b3656cbf1d6a.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 5452 bytes
SHA-256: 2f0857b3df6207b7a80b39c1d69b3c517cbe765c7ac4af99e39887a4bc51f2ac
font_01_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 11132 bytes
SHA-256: 69ee4e33a30aaaa7bed3da9a1ac5258912f645f93e4b588450d057bf1420f2a4
font_02_sfnt_off0001305a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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