Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a46d6564d36aa7…

MALICIOUS

PDF

85.8 KB Created: 2021-05-30 09:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 08eb92f5e65d0a066cb2e8715411f3be SHA-1: 4dd6d1adcc0d6efea2ba730f064999b9fb4b1033 SHA-256: 52a46d6564d36aa784d005aa72ac48b02625a39dd8f72d8ab4a0603bd2cb269a
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of 'utm_term=showbox apk 2018 android update' in one of the URLs suggests a lure related to software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://lozipotod.ru/123?utm_term=showbox+apk+2018+android+update PDF link annotation
    • https://peminikagi.weebly.com/uploads/1/3/1/8/131856713/nidirexen-reroxug-ruvemewurev-nugaxivagalomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_6018d8de04fde.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/kilesosoxepumit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_600991480998b.pdfIn PDF document text
    • https://suzaxuboju.weebly.com/uploads/1/3/4/3/134386311/nuriravijunitegoneg.pdfIn PDF document text
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/suwotijoxalite_padigekigan_fabifu_xudazit.pdfIn PDF document text
    • https://maduzoxunixeg.weebly.com/uploads/1/3/0/7/130775653/8541997.pdfIn PDF document text
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/zikoneb_sedalaxanereleg_siwaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460975/normal_6068bbce3b3c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379241/normal_5ff4c76859f74.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/1a92f068-c5e2-4567-b86a-9f0782ad2297/funny_losing_it_memes_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e054c8-c066-4a32-bbba-218065e3765b/tibukom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50db6201-1cde-4cdf-87bb-65df25c87e20/76706629866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c1d7ee-4bf6-41ff-9b33-327cf3673976/57362007031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd499be8-c389-49db-b572-c55ef196d2ca/sevoriporowadogofuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bba91b9-c1b6-44ef-b174-ab44770c9893/93480919712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b024b7c0-212c-4648-a613-bb1fcc0b788b/98926858230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd8fc2d9-028e-4c5b-bbbe-f3b2e1f40324/3501355660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83a3261-5c80-4c98-ba62-b005d57cf2dc/85395763806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3480bb42-6c57-4054-923b-0ebaa56c178b/how_to_change_the_battery_in_a_first_alert_sa340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32c8fd1-06fc-417f-80c9-31ab9e3bbbbe/83061895210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdad85b4-bdf7-46dc-947a-a8d54e6ffbc5/walmart_pharmacy_covid_vaccine_houston.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 5824 bytes
SHA-256: 747d5263fd59a3ab9ec2cc31102497c18779549a43022c97a8d58549ac973bf7
font_01_sfnt_off00011a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 1936 bytes
SHA-256: d2cd98eda3bb301c349f83497b116709750aa4c373c9bd198ee53ee8aab646d3
font_02_sfnt_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 11100 bytes
SHA-256: 79c6d17abcb5448082638fe0135a1e6185496e397ff5b71ddd73b8b5b4730dc4

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