Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b750f908722014…

MALICIOUS

PDF

87.1 KB Created: 2021-03-27 23:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 77baadd1948d3e93c3897bacfab470f3 SHA-1: fdf54d9df0d3371992bea6d3e909e2dabc3fe69c SHA-256: 27b750f908722014d5edcdf46a6a03c5ab4273f997d00f69bfe79f0535472b53
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and link farms, indicating a likely SEO-based lure for phishing or malware. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 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/award?keyword=semiologie+de+l+appareil+genital+masculin+pdf PDF link annotation
    • https://cdn.sqhk.co/zofizitene/ichiaib/53996326007.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/hbheWwj/49532428628.pdfIn PDF document text
    • http://nicechange.space/ford_ranger_4.0_v6_towing_capacityclmm5.pdfIn PDF document text
    • http://mandarins.space/26620177228vccud.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/rhhZO4N/26006530403.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/ihgSDha/jozepikeb.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/uhdahde/vanilajofexijedexo.pdfIn PDF document text
    • http://ryukzak.digital/la_carcacha_selena_quintanilla_letra8asq7.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/ijfghgl/2999953652.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/C3TAwij/bozebamatozefozibuwotapu.pdfIn PDF document text
    • https://cdn.sqhk.co/mizaveteg/fjgcQiJ/wabepixobiwodusovoziz.pdfIn PDF document text
    • https://cdn.sqhk.co/vefobinibe/C6heFYI/wekudusodexad.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/a7IVigw/all_for_one_dollar_store.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/dc1ac696-79ba-49d4-a501-61753fd2a4d5/zejexefubaxabawedafovabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbbebbf1-21ad-4751-912b-cf8b2f343a93/samsung_nu7100_43_inch_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18164bc7-7780-4a16-a4f5-c3ff64a4c7a6/kovifazelejetosixivedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7e29dc-88c1-4512-9d14-ab8b4f8ad231/25637900941.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_62c294f1a977427a99d4bc9ef6d08330.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_f89a3c811ac0499cbfbba51a08ecb8a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9171144-610d-44ab-a9dc-3df799129913/what_does_second-order_effects_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31f2325-0c29-44f7-ae01-9b1e90570c37/wunetupodupifudexobudi.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_a7c151050d6142f7899bdd2e97ec3999.pdf?index=trueIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_eccdad35fce64604a83578e4eb79cc4c.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_a2e3fdb5fd394d5784febb4cb908caa1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54bfd001-3964-414d-9c5e-33a28acb0457/69708019743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d54f4d-4b98-49ce-8953-8f51690e1c33/moneyball_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22680d0c-f2a2-46ef-b855-e4504fdac52f/united_states_army_special_operations_command_engagements.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_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 5580 bytes
SHA-256: 6cb67ff5fa3b0002c8aed5a1462d4f94ec083e07969f21446dc1acdeb2317c37
font_01_sfnt_off000124c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C7 12768 bytes
SHA-256: 2620e0848591c78c27235e9b7c7566ff78302f8b6f777a3e7f04bb88adcfe313