Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aff52c531bb59ab…

MALICIOUS

PDF

71.3 KB Created: 2021-03-14 12:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 834d9fa3936562a315ecbd05b4e6ccc6 SHA-1: 8462f164205d495a0cfdcae4d48a6521a41b8a6a SHA-256: 7aff52c531bb59ab7fdeb055a1b57cdd3b8e69199bc397baad11999d697334e0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=matrik+apk+download PDF link annotation
    • https://cdn.sqhk.co/javomekoru/jhlWqje/overkill_3_pc_keyboard_controls.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/72760ef4bf18b4.pdfIn PDF document text
    • https://gadebalemalun.weebly.com/uploads/1/3/4/4/134443756/3d19c6.pdfIn PDF document text
    • http://verifybadgesbusiness.com/serubelegujopewawabd0kq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_60176cc645c50.pdfIn PDF document text
    • http://uplrezina.site/superhero_coloring_pages_for_adults8ko1d.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/8ehiBhd/38010219938.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/igjaVpU/kijezaruperafuse.pdfIn PDF document text
    • http://ek-arenda.ru/how_do_you_update_snap_on_solus_edgejbjfs.pdfIn PDF document text
    • https://bamususifilozok.weebly.com/uploads/1/3/1/3/131383301/vonuxobo-butixop.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/jcfifKy/toy_airplane_flight_simulator_2020.pdfIn PDF document text
    • https://ropumalopiku.weebly.com/uploads/1/3/4/6/134613257/putapubanekud.pdfIn PDF document text
    • https://cdn.sqhk.co/sinonari/iiggjc1/walking_dead_world_beyond_recap_episode_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451752/normal_5fc8704362019.pdfIn PDF document text
    • http://yesstore.pro/enciclopedia_encarta_descargargswxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/5429881305.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/zusitokemoj.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_0fdf5c31c07b4589abcbf8bf27519ac7.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_c7d990a2bb204e9d9cabcf63d97adafc.pdf?index=trueIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_c4a91fbce69f4587a7ebec65245f5a29.pdf?index=trueIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_d8db6347601445fbacb53658374f9f3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piradi/what_is_pennywise_original_form.pdfIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_ef2de6cb91b84d8c9fed37c5c9035bf5.pdf?index=trueIn 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_off0000cf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 2960 bytes
SHA-256: 00c0a141202c10936ceac8b8df9df75720096dbedde9c5fde8d9f3447cbb363c
font_01_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 4936 bytes
SHA-256: bd2aa563c67b0b852cc0d4bf5da56bb492773acc9aade156dd7e6a74de4174bb
font_02_sfnt_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 10444 bytes
SHA-256: d901f93fed7b86d0e66d190408088684b6ab98cd5bf6a11cfb60bb113aa69a10