Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbf9e48a67b3e47…

MALICIOUS

PDF

74.9 KB Created: 2021-03-29 06:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cd50272154910d43f9d0089a0aad9b6 SHA-1: 7a1d14475af228cb632ee11f7a792800689ab085 SHA-256: ffbf9e48a67b3e47a35af2621fb7d45cd340a96358f7cd7baa6e171eb924123d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicative of a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs further supports the likelihood of this document being used to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/123?utm_term=ffxv+comrades+stats+guide
    • http://fikosarodone.medianewsonline.com/camino_primitivo_gronze.pdf
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5fc7d1f35bfd0.pdf
    • http://wewogokuwidu.mywebcommunity.org/brother_se_270d.pdf
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5fd110d84c336.pdf
    • https://cdn-cms.f-static.net/uploads/4497344/normal_602c21c28c6bc.pdf
    • http://fewutame.getenjoyment.net/megusejefo.pdf
    • http://fafuzum.sportsontheweb.net/95771363190.pdf
    • http://fepaporipevari.mypressonline.com/candida_adalah.pdf
    • https://cdn-cms.f-static.net/uploads/4381302/normal_6026f665c73e8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zazelujeju/couper_un_en_plusieurs_pages.pdf
    • https://s3.amazonaws.com/kukupunopedon/fanolunoxo.pdf
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_a7383ced29a740699318de3dfaf9eb28.pdf?index=true
    • https://s3.amazonaws.com/fivebo/70472575671.pdf
    • https://s3.amazonaws.com/wovedukevikov/does_dunkin_donuts_have_sugar_free_coffee.pdf
    • https://uploads.strikinglycdn.com/files/5a616748-e972-4f88-a5d8-ac11864b8786/work_and_power_problems.pdf
    • https://7915b8bc-6246-4d41-ad24-d7282f9ec2d3.filesusr.com/ugd/3bcfef_95e3d700f90a483395e55056dd254a5f.pdf?index=true
    • https://s3.amazonaws.com/takateg/adina_song_makoma_video.pdf
    • https://uploads.strikinglycdn.com/files/915253f7-f38c-405c-b497-341fdf0a94cd/elements_of_user_experience_epub_download.pdf
    • https://s3.amazonaws.com/vukusa/46229754900.pdf
    • https://s3.amazonaws.com/luworizesupox/using_commas_exercises.pdf
    • https://uploads.strikinglycdn.com/files/c7c1f4be-1f44-42a7-b834-fc6d39dd9666/what_is_information_management_systems.pdf
    • https://uploads.strikinglycdn.com/files/909e657b-5752-411a-9902-5f7f6618262b/jovadogiramidefu.pdf
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_9f1a5796a8994f4295ca0842a59dbb22.pdf?index=true
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_40c46cb230084344b9a492d716eb7bd1.pdf?index=true
    • 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_off0000e881.bin
7500bf50346819a025155e0fde0c13fd8f528f7e2ecb14a824ad9ac3cd160949		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 5392 bytes
font_01_sfnt_off0000fad2.bin
714c70fc6e063b79a6c1b602ef0e5df8f7140647560b7d3c6d6bbdd2595dd10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 10352 bytes

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