Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a5304a94fd1d35…

MALICIOUS

PDF

88.8 KB Created: 2021-03-22 00:28:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 32ab1e0b1b2a90cbe4b3b8eac3eb8c53 SHA-1: d74f9fa3b8c96c2cc3b13830ea78ded195f54856 SHA-256: f5a5304a94fd1d35856c14326728ddc8d95ba5566f0031033d2e93c014c63442
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to facilitate phishing or malware delivery.

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 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://soxebez.ru/award?keyword=bassoon+solos+pdf PDF link annotation
    • https://cdn.sqhk.co/desogepupema/cjdlMge/defender_110_pickup_cover.pdfIn PDF document text
    • http://dabopoxele.getenjoyment.net/kagitilufomegakev.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/10083431927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_60268e548c68e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_6057c5a573d93.pdfIn PDF document text
    • https://cdn.sqhk.co/gazejuruni/ig8Igdk/hair_salons_near_me_now.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/how_to_start_a_bakery_business_in_nigeria.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/11029807736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413236/normal_603652bdd0250.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/lVVhhIN/equalizer_2_imdb_trivia.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/hhgjhi4/marco_s_pizza_prices_charlotte.pdfIn PDF document text
    • https://cdn.sqhk.co/mizopopowaze/WTOibjc/turbo_cars_for_10k.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/hfjdKkS/98159313772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_601bfe3ea2d4f.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/68e8ec50-b588-4da2-93c6-c634ed071662/ps_vita_emulator_android_roms.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/fikevirejir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be9caac-91a8-43e7-bf13-93e88a92cafa/338362508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd18c081-c655-41dd-a8ab-00d8bf010d95/cyberpunk_2077_gameplay_length_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e9d65e-525f-4708-8e1e-cb5fd2423cf1/pirates_of_the_caribbean_piano_easy_slow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d911726c-a392-475f-95f1-18b957b06210/phrasal_verbs_esl_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 4988 bytes
SHA-256: 64951261ea5670465e66a7e306c84cf0c58208042fa154371264ad5cca8aee4b
font_01_sfnt_off00011837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11837 13472 bytes
SHA-256: bc4478d386504b966a52ab1524806e752a3a59008327beddeea504ba9cd74e19
font_02_sfnt_off000140ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EA 16120 bytes
SHA-256: 184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832