Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fa727c82eb3761…

MALICIOUS

PDF

74.1 KB Created: 2021-03-15 00:35:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e1f81304301349b7a83b17486d3c8c82 SHA-1: dc06ec485c8c02b3a3155b5d97a566012788e754 SHA-256: f1fa727c82eb3761c28e8744204328adc6317e8e75574b2ab766a86dbf8e7cd1
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic detections indicating it is a phishing lure, specifically referencing "Hays timesheet nz" and a "payment lure". The presence of multiple external URIs and link farm characteristics suggests an attempt to redirect the user to malicious sites. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pelibifir.ru/123?utm_term=hays+timesheet+nz PDF link annotation
    • https://cdn.sqhk.co/xawodoze/did9Dgf/claw_machine_arcade_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_60497f571f069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5fcac244bcf58.pdfIn PDF document text
    • http://gratoram.site/garden_eel_care_guidedunt7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380674/normal_5ff8ad386dd6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5fea1b5db88dd.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/dbjgifK/6263993962.pdfIn PDF document text
    • http://ctuxuu.com/does_bose_sounddock_portable_have_bluetoothp4tmn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_601ff3265961e.pdfIn PDF document text
    • http://1green.space/bivusufaloxuvacujv.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/99b53112-36d7-4405-b1ff-4c5f7ba273eb/89317848766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350ce0ec-aecb-46cf-b3d5-b74199f3368f/bimama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14732395-7065-46f7-a4c3-d89fa1cbc2af/rider_waite_tarot_cards_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8cd925-81fe-4e89-87ce-6ed296bb267c/lilasematilalinuberuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6d6e4c-1b3a-43ac-96c9-9bc98d047005/xopunabatinufetuzoduxuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9731aef-b23b-44ce-8c6a-9c5e93342f75/48820983469.pdfIn PDF document text
    • http://zivufev.rf.gd/jugowoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f02a10f-4ca6-4fd4-96cc-f0a04caaa333/who_is_the_most_famous_impressionist_artist.pdfIn PDF document text
    • http://kakafemapekumu.epizy.com/89526344269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0fc2fca-5f40-4b5a-b3f8-fe6b02002ebc/diccionario_espaol_latinoamericano_descargar_gratis.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_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 4912 bytes
SHA-256: b2524f61608e17fcc22c8d555c9c4ac809534725e5050c8144bb4790561d481e
font_01_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 10852 bytes
SHA-256: 5dd0370dd0cf1de348573bcdfd05535624c14a7889daf25fbcb353e07e4a5600