Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d3543425b8a5e9…

MALICIOUS

PDF

80.1 KB Created: 2021-06-10 06:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 27802cb89c1fd7ada26b440a780f2714 SHA-1: b979b8e602a99c9509f5ccaf871c01578466fa25 SHA-256: e6d3543425b8a5e9858a9a2e871e6263839703e28972b00c42f6fb72de101043
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://chcial.ru/pbw?utm_term=star+wars+9+full+movie+online PDF link annotation
    • https://xufuluzigi.weebly.com/uploads/1/3/4/2/134266078/4ac013fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5fd2eacbd101d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_6019731d41542.pdfIn PDF document text
    • https://lawamikakemudi.weebly.com/uploads/1/3/4/4/134477295/rajofudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_6010f448cc092.pdfIn PDF document text
    • https://sugabora.weebly.com/uploads/1/3/4/3/134369176/sekosojubo.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
    • https://uploads.strikinglycdn.com/files/23519692-1487-4954-bc96-47d6d279d346/julius_cesar_shakespeare_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df4b9d4-b5fa-458b-87db-e7bc488aeeb1/how_to_clean_bissell_proheat_2x_pet_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090076fc-826e-48ae-9291-fc60d4027e38/vanodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24569274-d8b7-4b2d-bd57-ed4f5b86cc21/how_to_fix_stuck_toilet_flush_button.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/96206785927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ff163b-4b03-4a7b-97fc-b9c193d786d9/easy_crochet_patterns_for_left_handed.pdfIn PDF document text
    • http://xivoxibuza.pbworks.com/f/1913598499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce82cb8a-c980-49ce-a243-214cc84bc819/75447457621.pdfIn PDF document text
    • http://pefumugat.pbworks.com/w/file/fetch/144683916/dell_inspiron_15_3000_series_cpu_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e8d427-cd5a-4d5b-9dc4-7d921e6d7593/my_paper_shredder_keeps_overheating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19894a3c-30a4-4711-a1a3-9bd511404f14/viwixego.pdfIn PDF document text
    • http://ganosidil.pbworks.com/f/american_headway_level_4.pdfIn PDF document text
    • http://lomubel.pbworks.com/f/mamma_mia_2_script_free.pdfIn PDF document text
    • http://numefen.pbworks.com/w/file/fetch/144632037/what_is_the_formula_for_calculating_the_area_of_a_semicircle.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144419160/is_there_school_tomorrow_on_presidents_day.pdfIn PDF document text
    • http://betifabito.pbworks.com/w/file/fetch/145011660/sword_art_online_alicization_season_2_episode_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dab1412-2111-41d3-8002-b3b3cecbdc1b/how_do_i_charge_my_magic_mouse_2.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144414156/names_for_pubg_generator.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/how_to_get_slope_of_a_perpendicular_line.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c37c4f-07a1-4749-b640-94d8b18f116d/a_christmas_carol_film_patrick_stewart.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_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 5208 bytes
SHA-256: 3e764ee8f1404db768ca0c852aa652d6b7bb8560933b7f195211c73da6b8a1d4
font_01_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 10924 bytes
SHA-256: 89c70f58cfbb6e94ec10dc8b42acad4795e8871070ada204e9f2324fc4866637
font_02_sfnt_off000124aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3