Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41e752274a3cd84…

MALICIOUS

PDF

80.2 KB Created: 2021-03-25 04:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6ca7faacaebac0c77bee010361fbd209 SHA-1: 1634911a3ad8f6b1eadd8e9703437f42167c4443 SHA-256: d41e752274a3cd84dccb3ab33d8a38eb8dc1d47134f84b07bdc21d0b510b3c56
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://dafemum.ru/wix?keyword=hulu+plus+cracked+apk In PDF document text
    • https://duwaxitim.weebly.com/uploads/1/3/4/3/134312722/63aa8a.pdfIn PDF document text
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/6066595.pdfIn PDF document text
    • https://ririzunok.weebly.com/uploads/1/3/4/7/134712782/puxavigedisuwarukew.pdfIn PDF document text
    • https://cdn.sqhk.co/roduxokixuzi/tiifibY/41766117572.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/zoom_modem_5352_factory_reset.pdfIn PDF document text
    • https://vejazisiji.weebly.com/uploads/1/3/0/9/130969480/vezagozomonekifene.pdfIn PDF document text
    • https://vewenikeluw.weebly.com/uploads/1/3/0/7/130739128/7225153.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/7833107115.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/gcibbC5/synthesia_free_download_full_version_for_windows_7.pdfIn PDF document text
    • http://desokore.medianewsonline.com/les_mis_2012_summary.pdfIn PDF document text
    • http://janipuwibir.mywebcommunity.org/4533122097.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/UhaheSS/carnival_cruise_cancellation_policy_due_to_illness.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/1056048.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/rebibojoxekejawibolesaxuz.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/e8b143b7-237a-432b-abb3-e809d67ceb3c/why_is_my_excel_sheet_scrolling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993c4325-ff00-47fe-8a58-60e81dc3e970/lilipufugeperikuwurixixo.pdfIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_f9dc1dda72c047c28c21de9bbaf2d014.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_96476d17e93440009d13e453859ddcfe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b4c3840-5884-4cc0-8c3a-3b234610744e/where_to_dispose_old_clothes_and_shoes.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_77c872f3ad6b482aa2e2c72aa667d2e9.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_71c2d93e56bb4592bff4c76d5bf031c5.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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 5092 bytes
SHA-256: bd2d53e6c456199e69e7429d46c2b8fa0bbd86c87a3db490ae62823c628aca0b
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 11088 bytes
SHA-256: 9c1d05fbd3a833ee0d953fc255647a1e0354ac79f0a1ef08ce1092cfb2e3c17c
font_02_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 16168 bytes
SHA-256: dcc437beaabc532c244cb2402c7e187dabb6fccd34af89cd9e2270a2a4498d3d