Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf3674c462311ba…

MALICIOUS

PDF

78.7 KB Created: 2021-06-03 05:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bcad418de5ea913ae25cdc0f418886af SHA-1: 7500e6e22723b90b046a224abe657399642d988b SHA-256: baf3674c462311bab548191fc7ad14fa2f117d96485ecf0ce369ab5bca6aa327
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 0.9990

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://philabc.ru/pbw?utm_term=what+is+best+to+brush+on+pie+crust+before+baking PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412896/normal_6065dca5d76c6.pdfIn PDF document text
    • https://sivobevabe.weebly.com/uploads/1/3/4/6/134665070/bokarevegez_sipudezudomade_xafodejanopef_lajawoxopalizov.pdfIn PDF document text
    • https://zerebutaravuna.weebly.com/uploads/1/3/5/9/135965874/zajubim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fede8d563756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_604823c40d8e8.pdfIn PDF document text
    • https://votetofovuwov.weebly.com/uploads/1/3/4/9/134901863/vebanemejipu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5fcefdd1ea339.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zigunef.pbworks.com/f/93506171540.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/f/94899580103.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/musogawozusag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9505b1-d187-46f0-88f2-036e6d48bdf2/lamiruwubuzed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2fb2fd-603e-40d7-9ec3-65fff73ead28/how_do_i_share_someone_elses_live_video_on_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a815187-2f46-4bdd-b1d6-d17e9aa9b2dd/how_to_replace_a_sole_treadmill_walking_belt.pdfIn PDF document text
    • http://rijunepupuja.pbworks.com/f/22076115539.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144534348/mathworksheets4kids_area_of_a_triangle_answer_key.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/25731700715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5bc0980-7cc3-4d08-abed-c44db06ec6ae/obra_100_aos_de_soledad_resumen_por_capitulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebf18db-a992-419c-a42c-092df8eba76a/54014308662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c424115-2612-40fe-9690-81fa475e992e/69889449816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa886a3-8507-4fc4-8039-43b890b918e9/jaxuni.pdfIn PDF document text
    • http://zexowisam.pbworks.com/w/file/fetch/144427884/el_manual_de_los_jovenes_castores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eab216a-0b89-469a-87df-f5853bb36f00/what_is_the_theme_of_wings_of_fire_the_hidden_kingdom.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/t-tess_goals_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b647aa-90f5-4d37-8144-26ccad778938/kitumemivumivepatatizo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 5344 bytes
SHA-256: b343fbdb5c35658d5cb096eb0d1bb4949ce5239670565c51f746b68eb0b65aa2
font_01_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 10464 bytes
SHA-256: 25ec522e8bf8732a59537692c92da4b2b3c1ad460e99b9a2325e247bb745a70c
font_02_sfnt_off00011e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361