Malicious PDF — malware analysis report

Static analysis result for SHA-256 832674901480771d…

MALICIOUS

PDF

84.4 KB Created: 2021-04-03 12:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 420a90b8cdbd72ea5a035b98aa0fec9e SHA-1: c898911ee7282c402ea5c25acc765dd612041764 SHA-256: 832674901480771d7dec34be371d140bbe09f43e49377e97772fbbebbdf525e9
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs that likely lead to malicious content or phishing pages. The presence of multiple external links on disposable hosting suggests an attempt to obscure the true destination or distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://maypoin.ru/award?keyword=blonde+hair+blue+eyes+karin+slaughter+pdf PDF link annotation
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_603fec1a49f0e.pdfIn PDF document text
    • https://cdn.sqhk.co/zufosupiz/E6Mijjg/10585504604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387920/normal_5fe5386294415.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/fWo8lja/xamobozititekutalizus.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/timhhm6/61190188873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_6015cbeda4e17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_d8d523b309ed4eca82aea6b95e5d0864.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_45363b61dd79428d9b0137453358c535.pdf?index=trueIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_c72c24bc1de9457ea6d900a800b97f9d.pdf?index=trueIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_5fdb2863364d4eda9ec8d5ffb1644876.pdf?index=trueIn PDF document text
    • https://c751e6e8-0850-424d-b14e-d7ae46260796.filesusr.com/ugd/bc1028_0821a7c2caef4b5ba5ec2341df2625f3.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_07b2ca0e816b48f7bcdece94724e6f8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/804d7d52-898a-4cfc-bb6f-061e918f5ae0/33185524885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2126f4e1-f8f7-488e-bd03-0858d5fa7ed4/76278699181.pdfIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_6072976a77f248dbb5c39de4a0ba41d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/771e4736-40e8-49e9-8336-e3d1e7a0d39e/what_oil_for_honda_eu2200i.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_65be303643c34b01942e2d0d27de8461.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b49bcc-03e0-4627-b689-c56f917cecef/chrome_flash_player_not_supported.pdfIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_32059e49d6ab440690016dbde12b46d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadf9b1e-ef74-495a-877b-5b3587875483/does_vicks_warm_steam_vaporizer_need_a_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d168926-1882-47a5-b60d-a9591b585505/naziwupaka.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 5660 bytes
SHA-256: 2c2f3e8a39172a863434c3c2e7d3bb222eb58c6ac619190111075c7a25c5ae04
font_01_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 9452 bytes
SHA-256: af1b71178367c18f120c42053d6a4f2de711adf3d2c205202df55d51c08367d2
font_02_sfnt_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 12328 bytes
SHA-256: 1fe92b328ee9a03a6e4899f5c515fc22660090851d10d7facaba066b1873e385