Malicious PDF — malware analysis report

Static analysis result for SHA-256 305f1c38295f3266…

MALICIOUS

PDF

78.2 KB Created: 2021-03-22 19:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: de5552d27eb9326e300f882fa71be87a SHA-1: 4d5cd08765bd563bf65a85422bcf522fb03ef7ac SHA-256: 305f1c38295f3266ee873a8de09622e436c92bc40e6eecd4d7dd9d6f6bad5512
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or redirecting to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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/123?utm_term=concerning+hobbits+tin+whistle+sheet+music PDF link annotation
    • https://cdn.sqhk.co/letiludixo/hagiijy/bhojpuri_song_mp4_hd_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/1ibhaie/canadian_f1_tv_coverage_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/geVghpT/how_to_open_laptop_screen_lenovo.pdfIn PDF document text
    • https://cdn.sqhk.co/wamefuvew/6trkWjd/idle_balls_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/vogigoda/jhdjaTb/agama_islam_di_indonesia.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
    • http://roxegut.rf.gd/what_do_ellipsis_mean.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_fc582d3ea44942d9873cfe2c36d15294.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_c15fd035b91e404ca93bf58e24685af3.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_d846d4ecb22e4f7fb3889311c9d3cf8c.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_bb4b42840a964ad6b6d93ad9fe760b28.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_77e9b1e549ae4d18a2cd1802a04b31ef.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_627c81e7f1074851b2a86d100ac579c0.pdf?index=trueIn PDF document text
    • https://dc5983eb-04eb-4341-be6e-5f763cf8c8d0.filesusr.com/ugd/979c04_8d7bc0d7a4be44fea203f690cc2fcd6f.pdf?index=trueIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_7401ed96183840429bc498a823dbce1a.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_8f24c602c5bf4af88eaa98af455c3ea2.pdf?index=trueIn PDF document text
    • http://pibusobi.epizy.com/pejavixaf.pdfIn PDF document text
    • http://nirutavikuda.epizy.com/renif.pdfIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_d940c74136344304a9d9f20b0490794f.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_bb0743043f494ca695a1e28abc6928b2.pdf?index=trueIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_b18e164a5a0644cabf640b1ac79d8cc1.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_5d604eb8ffe941e39be61742873fa399.pdf?index=trueIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/kavanajesuza.pdfIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_3bd45a12b46e46a493066b82254056f2.pdf?index=trueIn PDF document text
    • http://putagasixebe.epizy.com/veboma.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_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 5140 bytes
SHA-256: 95f407f550845461eb64054f7014f090a921d3212593eeece92d969b5913d0e7
font_01_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 10668 bytes
SHA-256: 970392117cf379d450b2b7479b0b1bbe44f51209fe538aeea21011ef87fb9cbf
font_02_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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