Malicious PDF — malware analysis report

Static analysis result for SHA-256 5824598e1201e944…

MALICIOUS

PDF

60.2 KB Created: 2020-11-18 06:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f0cc08382af865c32987e12bea50dc1f SHA-1: 76023b88c6e01e7d55df5292900134f26c04bc52 SHA-256: 5824598e1201e944cb581ddc12063966d5aa4cd56f13a77590ea5df77118715c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to lead users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. The presence of a URL with 'utm_term=truck+loader+5+unblocked' suggests a lure to attract users searching for specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://gettraff.ru/123?utm_term=truck+loader+5+unblocked In PDF document text
    • https://nuzokubipodopu.weebly.com/uploads/1/3/4/7/134732356/jozozan-vizuxe-julixedefetumaf-tetugumobusafa.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/8277511.pdfIn PDF document text
    • https://sobepaded.weebly.com/uploads/1/3/4/3/134305425/kajogugis.pdfIn PDF document text
    • https://jexenixikejov.weebly.com/uploads/1/3/4/6/134632916/303653.pdfIn PDF document text
    • https://zizolewezefid.weebly.com/uploads/1/3/4/7/134702939/79b646b41019e1.pdfIn PDF document text
    • https://felomogolupa.weebly.com/uploads/1/3/4/3/134345494/jibizi_doxitakigovi_dobofezazus_kewebidili.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/2a2e4b6ae9e4ad6.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/tixoj.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/90fb4bed-fa81-4ded-9db0-50988d1b1b4e/61373887312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cda50c2-c3b0-4724-b2f3-0db18ebd002a/bomowiraf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2360335f-8862-451e-a6cc-e98f4bd535b6/jigofogumes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78bbbcd1-9e5d-469c-acae-b190ec0db678/sazomibolofawujomipagog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58cdc3c3-0059-44a9-8b4f-a4422d25293f/guia_de_movimientos_de_musculacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd148b4-04fd-4e95-9718-13cbea25055e/gaming_mouse_pointers_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46116af-7c31-4e31-ae65-7b2623691623/deadpool_2_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d58deb3-1e71-4e16-a661-1e1fe2f9982a/g1_ase_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf200d0-8e1a-41e1-b995-3a17da3f86fb/fudukowanejuvotakis.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_off0000b355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB355 5032 bytes
SHA-256: 61c89e126a90872c0f716db08de1a390223891db8e6c1702c2ddb2ce4876d31a
font_01_sfnt_off0000c488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC488 9252 bytes
SHA-256: 1c6a22cdcbaed72d271663da74ea58e7d89ad9b5156d15d63b58b5f4ad392485