Malicious PDF — malware analysis report

Static analysis result for SHA-256 267f58428c674430…

MALICIOUS

PDF

84.3 KB Created: 2021-05-23 14:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f9a8070b2341f03cf00f3ba1f9558d67 SHA-1: c1595289e0d1f976054365cb406b9ab7fd88f439 SHA-256: 267f58428c6744308f26d4b1a54bcdc5e555126330c61839ff44c5c4a16efe5d
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 0.9996

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://jacksth.ru/strik?utm_term=how+to+use+original+ergo+infant+insert PDF link annotation
    • https://nefikeroliv.weebly.com/uploads/1/3/1/4/131453179/d5d4c2cd3457da.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/8341124.pdfIn PDF document text
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/dowodimokoxuxe-xavibakojezi-jamupapepiba-roposozewene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484370/normal_60507b00ea535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485703/normal_5fe65197a8aa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497356/normal_605ffc29ca65f.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/fanonupinapirik-lifovatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_600ebcfabeea0.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/vezimezizotew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474211/normal_6007e257732c8.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/25399320-1b22-459a-9fd0-45bae9fba5f4/7611875851.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/98654660967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/107c894a-5263-4e14-b666-b364b90e2320/how_to_flying_lantern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90d7a162-66e9-4246-81ad-b0cd65315f2e/74969038127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1be89431-4bdf-4332-90dc-bf421aa497a2/short_film_business_plan_example.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/insurgent_full_movie_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff3603e-6d40-47f8-9d02-1f078d676c93/how_to_use_a_keurig_mini_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/canada_latitude_and_longitude_worksheets_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53adf593-bc69-469e-9914-88348189e30b/79004459411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70973cd-5395-42cc-9efd-3f3cf0883913/22527484105.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 4988 bytes
SHA-256: 56298b55a7ec28e7976a2e262b99d652acf7d106d56c19fb61c15c059002e348
font_01_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 11324 bytes
SHA-256: fbfb18b5dd377abe208570c27524f5a9209c2c5da30b33368323feee654370f3
font_03_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15