Malicious PDF — malware analysis report

Static analysis result for SHA-256 d518500b06918c45…

MALICIOUS

PDF

70.9 KB Created: 2021-01-08 16:37:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a1380fe2c0938f333f2138d5c226cafe SHA-1: e6520d0cef4d8ecb223430a0bd512b3d56224bff SHA-256: d518500b06918c4571629cd3be09f7675058523a4b70ab1d94b56ca6c53baf68
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or to distribute malicious content. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent, specifically identified as phishing. The embedded URLs, such as 'https://trafffi.ru/aws?utm_term=5+stages+of+grief+worksheet+pdf', suggest a lure to a malicious site. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffi.ru/aws?utm_term=5+stages+of+grief+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/mozulunilex/cLjdlif/miranda_kerr_wedding_dress_orlando_bloom.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/rmiciaR/narokogapoligob.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/punosekimi.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/eX8if2m/suvalikexupib.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/jfsOvjj/food_wars_anime_season_3_netflix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_5f96329c94435.pdfIn PDF document text
    • https://cdn.sqhk.co/sofopiro/jhhjFie/pocket_minecraft_seeds.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/674d379c-077a-4da0-bf7e-25160e7221b7/argus_manual_11.7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a612e174-8bdc-485f-af5e-14d0c7ac3912/lori_loughlin_updates_tmz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6197b0ba-6a3e-4bdb-8b0b-db3d5e27086d/place_value_and_patterns_lesson_1.1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3228909d-6640-4a8d-a741-50b88eb48191/63550731077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b472ee-77d0-4046-8d51-c0259e70aaf8/the_improv_orlando_fl.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_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 5136 bytes
SHA-256: ee8715c69c9f92b427c00e5870d38b23d2aa117d22c943303923b4f728085676
font_01_sfnt_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 10764 bytes
SHA-256: 515f41bbf382b816b4e1e6f1a8e279d03160b88470cc3f35df590e3ff9682662
font_02_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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