Malicious PDF — malware analysis report

Static analysis result for SHA-256 8640d3dfb14cd4e3…

MALICIOUS

PDF

94.5 KB Created: 2021-03-28 00:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 40b2069cb0cfc7504795aaaed3a7d32a SHA-1: eb132a5faa602415408158d4c26dd9535d7a6d0a SHA-256: 8640d3dfb14cd4e34780ff427dcdd1d48da3d9e7fc8714130bbae38086de856a
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://mezovuduw.ru/strik?utm_term=the+house+on+mango+street+theme+statement PDF link annotation
    • http://waxedeb.getenjoyment.net/83056934538.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/kalifibuzixob.pdfIn PDF document text
    • http://dezowem.medianewsonline.com/adobe_acrobat_reader_apkpure.pdfIn PDF document text
    • https://dikufakeg.weebly.com/uploads/1/3/5/3/135348043/2043096.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_24ccf91c6cc84d0ca553d928cb6b5e82.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_fab3fd6e61204730b5ef33dae042cef9.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_73a215a86bc14bd285942eed4fa785f3.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_59ee9aa2ba8142338f1ddec0f5ca710d.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_6449e91e08b24cc392907559e5b2a9cd.pdf?index=trueIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_803111701c364ef388cd0f0fbfce58a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c535c5f-816f-4ded-97e7-7e491328520b/miniature_dachshund_puppies_for_sale_carmarthenshire.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/patrick_fitzpatrick_advanced_calculus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22507134-95a7-4ebc-bd6d-ab4399e20d7b/drow_of_the_underdark_3.5.pdfIn PDF document text
    • http://dinupuz.rf.gd/brothers_grimm_short_stories.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_2eb87ab2340d43adbfa4283cff5cc0dd.pdf?index=trueIn PDF document text
    • http://nipadisunusupuf.epizy.com/96813909898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec22467-04e0-4c5e-ad1c-151b9fe67979/48497275100.pdfIn PDF document text
    • http://zuvolape.epizy.com/bimirusofegudezabomisopon.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_147a35204d6f49e3951ff55305faf50d.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 5016 bytes
SHA-256: e87508d5e3dd3b269e216abde7511aa5db789de7988365c160406744f4b71c02
font_01_sfnt_off00013102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13102 10988 bytes
SHA-256: c2d6a8280b3b824e963c0778f0b4e779456cc4e8a6b55b4a08b645401bc5c3c6
font_02_sfnt_off000156a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A4 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf