Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52819f64e8ccadd…

MALICIOUS

PDF

75.7 KB Created: 2021-03-10 16:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 75dd8fcf1dbdd2ffed9e968772f8c19f SHA-1: b54d1dccc2bfef0ad2537df594270dc01f048f9f SHA-256: f52819f64e8ccadd0f66622cb3ada0520476c9d12b05912ba95bfe8a92f0ccb7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/123?utm_term=game+of+thrones+violin+sheet+music In PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/4883120.pdfIn PDF document text
    • https://cdn.sqhk.co/gigatakel/fOBdEib/revolut_business_app_not_working.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/54866770931.pdfIn PDF document text
    • http://wasukowoko.iblogger.org/guitar_picking_styles_youtube.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/13577015967.pdfIn PDF document text
    • http://rukaranu.22web.org/caballo_de_troya_9_jj_benitez.pdfIn PDF document text
    • http://tazizinujumijoj.mywebcommunity.org/samsung_rf267_not_making_ice.pdfIn PDF document text
    • https://jigebizelu.weebly.com/uploads/1/3/1/4/131438259/surolujid.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/mental_toughness_of_navy_seals.pdfIn PDF document text
    • http://malapiwo.66ghz.com/givowofomivomasujavodube.pdfIn PDF document text
    • https://tulaliferejuza.weebly.com/uploads/1/3/0/7/130775137/kitubudanofiti.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/wogunoxapufadojapatupavub.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/ggijihc/zombie_offroad_safari_mod_apk_obb.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/vezivologetobagebok.pdfIn PDF document text
    • https://cdn.sqhk.co/zonigita/1l2pieN/paypal_prepaid_card_gift_card_balance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jatugeset.atwebpages.com/bebajidatakijawetul.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/zugovituzotumar.pdfIn PDF document text
    • http://benatababede.rf.gd/vejumexinogas.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/57097187306.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/62974017544.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_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 5212 bytes
SHA-256: 38c7ef8ae5e611cc3eeda884cfa5c0d4f56189ed6a672f87b90a58960de25aac
font_01_sfnt_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 11128 bytes
SHA-256: 6fc97cab3e61ca4903591fd13053af8743575a3863dadf3fd3ae6e5593db8d8c

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