Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bde07f91b2b22a3…

MALICIOUS

PDF

80.3 KB Created: 2021-03-16 01:32:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e46dff32ac01a28c2710d9c5eb3ef1d4 SHA-1: d33dfcd93d1c5adf73f4e22127e317b87acf79cf SHA-256: 8bde07f91b2b22a343812f9ee4886d799136b3b1d63eea35551fe23ca6699668
202 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ML classifier and ClamAV detection. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of urgency and download button lures indicates a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/wix?keyword=pobre+ana+bailo+tango+packet+answers PDF link annotation
    • http://dalkomis.website/maze_runner_4_trailer_espaolqeckr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_5fe8d8ae8517b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5fe4d12a3b36c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_5fd7d0426353a.pdfIn PDF document text
    • http://uose.xyz/asmaul_husna_dan_artinyaorqzx.pdfIn PDF document text
    • https://womazineput.weebly.com/uploads/1/3/4/8/134895737/9410822.pdfIn PDF document text
    • http://hotita.space/asymptomatic_carotid_stenosis_nice_guidelinesyijwo.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/gesaxutamo_bovagev_wenefewulamifo_kelak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_36e2d8239fa44637870e524f11779048.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_2eb360b72bea4e0dae8d409e1c612530.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe541fe4-c211-4ca2-9037-08bc017a6d29/sewerirezewofezukesim.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_b5138f3faebe4066a7dd1d2bcef2027f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ac7cf0-18c3-45c8-84fe-45e07d7f4dfa/setiforosiwokukunafe.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_8eb8bfa55c0248c986e4a11c03f94212.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c44484e-15bc-4c51-a942-d7fb143fddd1/what_to_do_if_tablet_doesnt_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4101e143-4555-4799-bdb2-ed30c60ab0d6/four_seasons_worksheet_grade_2.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_6da6504699ec4b1aa4b457c9f9d8c55c.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_30c0b72916cf44b6b8402a3a9599b2a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e54764-a3fc-407a-9f81-7588affb06d9/can_you_get_new_battery_for_kindle.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010891.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10891 23304 bytes
SHA-256: 84ded29ff15bbfedfebd8ba5578c22b82fa041412c70bf4a191cb8080763ac5c
font_00_sfnt_off0000d197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 5400 bytes
SHA-256: 8997b7c120aa476cbbddb1a5357da57bff5c27f9723f502f108a59b94bec6797
font_01_sfnt_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 10648 bytes
SHA-256: 20686369351a3b37fda9dc6cf10ed949b2ea7b91eb0614ec5e9c1c166b787251