Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1dca79ad8eb79a7…

MALICIOUS

PDF

80.8 KB Created: 2021-05-30 03:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2f6a7dd432bbc8a0da285ee0a69a052a SHA-1: 8491c635f149bf7875f0ba51a5c4c5a30064cb6b SHA-256: e1dca79ad8eb79a7f88e54070c76ff015087a5d851e3a9ba4a4fe8c791343729
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://soxebez.ru/strik?utm_term=monoline+lettering+worksheet+free PDF link annotation
    • https://rowimibakerideb.weebly.com/uploads/1/3/4/4/134494798/9970962.pdfIn PDF document text
    • https://tamilazubi.weebly.com/uploads/1/3/4/6/134604156/fajefilewe.pdfIn PDF document text
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/damag-badaweg-ziduje.pdfIn PDF document text
    • https://jimukara.weebly.com/uploads/1/3/4/2/134235432/99723.pdfIn PDF document text
    • https://jimoporifu.weebly.com/uploads/1/3/4/3/134378689/abb594ce71796.pdfIn PDF document text
    • https://jumalevejuza.weebly.com/uploads/1/3/4/6/134690248/802a93abce6ed2e.pdfIn PDF document text
    • https://peniluvemafoni.weebly.com/uploads/1/3/4/7/134705148/5702787.pdfIn PDF document text
    • https://tidurikax.weebly.com/uploads/1/3/1/8/131856133/3eeb16832213e66.pdfIn PDF document text
    • https://retevewaluwur.weebly.com/uploads/1/3/4/6/134600892/vewefu_lores.pdfIn PDF document text
    • https://sadusanolomu.weebly.com/uploads/1/3/4/6/134646393/32fd5af.pdfIn PDF document text
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/2770330d7.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/5d82af81-f20a-418d-b141-e8a78620760d/what_is_the_summary_of_she_stoops_to_conquer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b4101f-292f-410c-ba89-8616db1e03f3/what_does_vegetarian_mean_sexually.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa6e4bf4-bbb5-48d6-b155-89bfb67dc387/how_to_start_blender_animation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b3d774-189e-465a-aeed-0f4af89ecc65/probability_and_statistical_inference_bartoszynski.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a7804c-7fd0-42eb-a969-f016bba8c45b/origami_heart_with_construction_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31025e0-6399-464b-9b7f-2790a7708a9a/sujune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48290e14-5d11-489b-84b1-fda771535434/2006_chevy_malibu_maxx_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8694dcb-027d-4811-9006-12338f6f2d90/86056200235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e96f28-5375-4eb4-8fe5-bea226fd6aa9/73656772398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce667256-0a43-41e2-9f18-af29559781a8/which_mac_operating_systems_are_still_supported.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a57d32-5a61-4c1a-8bc8-c9bb8c5d0cae/jizewafiwirorobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ab2bf4-b9a2-476c-9b17-4f99c5693bb1/how_to_find_angles_of_a_parallelogram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8316a9-f5ca-45c1-a298-deb8e775db12/driving_directions_google_maps_api_example_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/204036c3-6985-4847-8f90-7d5955f1d8b2/fender_passport_deluxe_pd-250_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f0741b-c905-4d50-8055-d9aa808f9ab4/vamomuwizipuwip.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://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_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 4980 bytes
SHA-256: e09789601c345d231e86dc020a2be8717cc998ccca6bc67ba0da6eb88f71d407
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 10884 bytes
SHA-256: f535a472e89a1c0055e45c6b8fdf8306f1eb19f718a553c2d92353294380dbdd
font_02_sfnt_off00011f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940