Malicious PDF — malware analysis report

Static analysis result for SHA-256 273a5106bc6378d9…

MALICIOUS

PDF

80.4 KB Created: 2021-03-12 11:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9b85069f24427b6a38cf74e88e01c2a2 SHA-1: 66f5978e5bc77b2e309b14fedba6d30c93ebb4c0 SHA-256: 273a5106bc6378d94a762f7c47a590c6e04e04e65fef61e2b257c19c6785cd32
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 0.9997

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://jumiwimov.ru/wix?keyword=ilocos+sur+news PDF link annotation
    • http://iclod.tech/guxadogipomosoz4sfk.pdfIn PDF document text
    • http://wuramegojuluz.mywebcommunity.org/tudumuze.pdfIn PDF document text
    • http://crysety.xyz/unesco_2015_global_citizenship_educationnuqc7.pdfIn PDF document text
    • http://logoped-samara.ru/bunn_slush_machine_manualvoztx.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/favozod.pdfIn PDF document text
    • http://f1l3download.site/kupavapulk12s.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/6d229934-e192-4a86-83f1-7590daf8317a/traditions_buckhunter_inline_50_cal_muzzleloader.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/tepezuwadozokemum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df48883-2984-49e2-b775-11b87a946d75/tokyo_ghoul_op_2_roblox_id.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3baf5798-5a70-4bbd-bbd4-8ddd0cdb6214/50759449733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5cf439-3566-4168-97c8-1a6ae44e986c/zuwadag.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/10389222739.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/dependent_drop_down_list_google_sheets.pdfIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_01fb48700800445d98caff0aaca3395b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d70a75f-0da8-494b-a48a-3248a03995fa/crock-pot_express_pressure_cooker_csc051_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a1bc88-2517-491d-9443-c2d26a22c97e/how_to_draw_comic_strips_easy.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_7a954e1bf04248888a10164de0e31dde.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5e03a3-b09a-4601-bf53-02250be3f78e/python_data_analysis_course.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_f345b41d063e47afac3fe5ab5097f533.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42bc4d2-a1b9-4014-839f-cf69a3bf3f25/delonghi_dds30combi_dehumidifier_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131eca70-ff85-4b28-9550-be40b27cb539/which_is_the_drain_hose_on_a_washing_machine.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_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 4612 bytes
SHA-256: 00b592650ebf09de8863a5ed388f62d195b2a0d29050dd81e0c6644fa2683122
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 15108 bytes
SHA-256: e6c0af0eb358b9d62f664f11463c7e1a28fa702c9e94e39bf98a3740ca44d10f