Malicious PDF — malware analysis report

Static analysis result for SHA-256 d977ba215fc88445…

MALICIOUS

PDF

76.5 KB Created: 2021-06-05 22:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 82e1142ca00c8c2100ec032dcea27fa3 SHA-1: 9cd96801f463d41540bb0d18936f3d13273bfb6b SHA-256: d977ba215fc884455c9038447e71ada086550e09919a55f68cfb6a4aedcc961a
226 Risk Score

Malware Insights

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

This 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 hosting, suggesting a link farm or SEO manipulation tactic. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with 'powershell_disable_fast_startup.pdf' suggests an attempt to disguise malicious commands or lure users into executing them. The embedded URLs likely lead to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://allytemp.ru/pbw?utm_term=how+to+turn+on+bluetooth+using+terminal PDF link annotation
    • https://bofaragimemax.weebly.com/uploads/1/3/4/0/134096626/jalonixivopofij.pdfIn PDF document text
    • https://kenazago.weebly.com/uploads/1/3/1/0/131070597/6340821.pdfIn PDF document text
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/fawusezinud-lotirugulabi.pdfIn PDF document text
    • https://jajoteraluwem.weebly.com/uploads/1/3/4/1/134108878/82b57a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388626/normal_602995dac2b2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409093/normal_5fcd991e4c9a1.pdfIn PDF document text
    • https://fufilotaniwa.weebly.com/uploads/1/3/5/3/135321354/9acc0e350d8827d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_602908fc82765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_60bb44a4e023c.pdfIn PDF document text
    • https://divaruwidis.weebly.com/uploads/1/3/4/0/134042650/c8343e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_5fe730750523d.pdfIn PDF document text
    • https://nojesinas.weebly.com/uploads/1/3/0/9/130969722/bazedinepeb.pdfIn PDF document text
    • https://kenazago.weeblyIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/281fd763-dad3-418a-8020-52d0e805a892/derrida_before_the_law_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7b4b58-76a0-4f31-b25a-90944991ea41/windows_10_powershell_disable_fast_startup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbfd8a0-305e-49c5-bd84-836e8e585bca/74084969258.pdfIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/0da2d393-6485-4dd7-ad64-87ae1f477539/43148451171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ce52b1-2901-4d02-a6f4-28955f224bb7/jebewiruwetetuxoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56cb9629-084e-440d-a87f-4ea71dc75b15/how_to_set_nikon_d5100_manual_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602345e1-f70e-4b05-9094-3e58114ea2a2/46448245781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68132f3e-9e41-4b32-8416-5e5b00a7bad8/armitron_all_sport_watch_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917f0e8e-917f-4803-81ed-d953043eac49/casio_graphing_calculator_fx-9750gii_manual.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_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 5292 bytes
SHA-256: f9901c7e06e9a753c071c070b0f4462c017714d15bc8030e2539b752e0fc339c
font_01_sfnt_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 10952 bytes
SHA-256: d0bfbaccb1b471a2f16939eeb45f8a467400ee9f9fe6d722b0059b01e2ebd61a