Malicious PDF — malware analysis report

Static analysis result for SHA-256 20960d5bb1c03d97…

MALICIOUS

PDF

81.9 KB Created: 2021-06-13 05:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d8ca5d16d2c5639c7fa03e09fef208e8 SHA-1: e5aaec6fa8a36670ee0953cf261d3b1c7c5e2d44 SHA-256: 20960d5bb1c03d97052092599734a233f74779fc20367362c0cbcef0781d4c48
126 Risk Score

Malware Insights

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

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 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/pbw?utm_term=stagnetti+revenge+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385859/normal_60319317f4083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_6062b48646d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_6049e5b20562f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491688/normal_6001f09974d59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_6024c3077cfee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_60371d82dedab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495257/normal_5ff50a35cc429.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/e0f9edea-16be-4b32-becb-ce072f58382e/20303483353.pdfIn PDF document text
    • http://felinemumivu.pbworks.com/f/pichaikaran_tamil_full_movie_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52a9b2c-85db-4eec-b5f2-97db48bad8e9/wamomewololizavukesokek.pdfIn PDF document text
    • http://gaxezuv.pbworks.com/f/silerun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e7fb69-3e04-4145-afba-c77ef186a49d/angularjs_2.0_tutorial.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/bhojpuri_film_gana_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e60fcb4-c312-47c5-9612-ea50c6b74ebd/76069648947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ccc4462-0d8e-4b0a-bdfb-b9a0d690f968/mezogesisawukubevex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0de1628-ebfd-47f9-ad7e-84b146e6ebf2/what_is_the_difference_between_supersonic_and_hypersonic_flight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a5d14b-fc00-4f9f-8026-edaa9aa8a4f0/pemul.pdfIn PDF document text
    • http://fepazonavu.pbworks.com/f/simasikomivovezerixugasum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a402b24-4412-409c-bf92-79fc577d421d/29619951923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4853f216-a53a-46fb-99be-d3de79f81bca/suntrust_bank_florence_al_routing_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5dcac4-3a3e-4164-9076-14cd1379b305/27819929559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf84670-40f0-4fac-9ae0-4569a9c4085a/40228453437.pdfIn PDF document text
    • http://fawitugeva.pbworks.com/w/file/fetch/145201695/mereposisorulewu.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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 5152 bytes
SHA-256: 3afbf785d1b894831f888721a60d84f798c27f5ae647801d57896e9b83738598
font_01_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 11144 bytes
SHA-256: f0ff8008a591b064f8c254285f9be225120369c52f35ad4911fc2e92579f10ed
font_02_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 16116 bytes
SHA-256: 3dae81b76154e7c62b3b0d30507344c78f02ee9172d09a03fe7a9af96af9e849