Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fbf3d047d22594…

MALICIOUS

PDF

73.0 KB Created: 2021-05-28 16:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f6d697462356e7dd9596225b1fa8d47 SHA-1: dcc8c09f0da96b30a18773be182da06a11c3fbba SHA-256: 54fbf3d047d225947ffaed01c90c15d4ce56369d5eafa8534ffe1feed0db983d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a tactic to distribute or mask malicious content. While no scripts were explicitly extracted, the presence of external links and the 'Pdf.Phishing.Trojan' detection points towards a phishing or malicious content distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=pride+and+prejudice+piano+sheet+music+pdf+dawn
    • https://cdn-cms.f-static.net/uploads/4481069/normal_6058ad24e3c89.pdf
    • https://libakitaxejadeg.weebly.com/uploads/1/3/4/0/134096258/madijifemajim.pdf
    • https://pimipile.weebly.com/uploads/1/3/4/8/134883166/64a1d.pdf
    • https://jokikisiva.weebly.com/uploads/1/3/0/8/130873994/rumujotomawenu_tojel_jozigabodokifox_pomobusu.pdf
    • https://cdn-cms.f-static.net/uploads/4380545/normal_606b9a8cd881c.pdf
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5fc7119c33b9f.pdf
    • https://nabutamu.weebly.com/uploads/1/3/4/5/134525390/fijoz.pdf
    • https://static.s123-cdn-static.com/uploads/4480170/normal_5fccc2cd53972.pdf
    • https://cdn-cms.f-static.net/uploads/4425010/normal_600dd3b23eb20.pdf
    • https://vitiwujujoter.weebly.com/uploads/1/3/4/6/134659282/397564.pdf
    • https://rosufira.weebly.com/uploads/1/3/1/4/131408230/03b5261f98ca.pdf
    • https://baveretam.weebly.com/uploads/1/3/5/3/135314503/5069218.pdf
    • https://cdn-cms.f-static.net/uploads/4501027/normal_6010ca73c4ebd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/00db33ce-caf2-4224-9e7c-7155cb053c0b/zumuxil.pdf
    • https://uploads.strikinglycdn.com/files/f4644db0-f805-4c83-bb84-59215a7c4b4c/67120406803.pdf
    • https://uploads.strikinglycdn.com/files/8ae1fa6d-4284-405e-a5d6-842c58ffea10/24747890372.pdf
    • https://uploads.strikinglycdn.com/files/134d618f-bd60-4978-af09-a2990dd26af1/83189145339.pdf
    • https://uploads.strikinglycdn.com/files/72ac481e-3c99-43f9-b81f-ccf56dfc5ddc/can_you_watch_marvel_films_on_netflix.pdf
    • https://uploads.strikinglycdn.com/files/8c8b7a7b-b0e2-4459-8667-1bda9a4caccf/maytag_5000_series_washer_f35.pdf
    • https://uploads.strikinglycdn.com/files/fdf3766e-897e-4b28-ab7e-f9d8dd131e42/yamaha_rxv677_firmware_update.pdf
    • https://uploads.strikinglycdn.com/files/2cf51bac-4e19-4a4a-93ef-a582834bf678/bose_wave_soundtouch_music_system_iv_bluetooth_adapter.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deed.bin
14d92c0e98bfb30b9491385fe09c36f5b4f02b9e4574b84c59f95c25d4b3dae0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 5532 bytes
font_01_sfnt_off0000f1a7.bin
48a413ebc7edcb10e06a8721a8d4f5f663c0490ae0255bd7415ed5fae3c562bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 11060 bytes