Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2744c2d0d9dcf62…

MALICIOUS

PDF

80.5 KB Created: 2021-06-12 00:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ecc8349fd2a6a1cab9846214e94d18b6 SHA-1: 1610ce4401345dc16df153fa921726b63751ce3c SHA-256: a2744c2d0d9dcf62edf4c62f8ca1331e8d1facb2b1b8590a1b5a9d8c7dbfdc14
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 0.9996

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://infrive.ru/pbw?utm_term=recaptured+by+the+crime+lord+read+online+free PDF link annotation
    • https://nilunoxevolen.weebly.com/uploads/1/3/5/3/135348116/483fd.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/7658047.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/lidifakazigu-revilizezofojok-dazozupejafufir-miwemaxan.pdfIn PDF document text
    • https://musejeruz.weebly.com/uploads/1/3/4/7/134740211/nawisuwidanegusazok.pdfIn PDF document text
    • https://vuterezupip.weebly.com/uploads/1/3/1/3/131380942/negifasunaboku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_5fd7614ae1da7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462339/normal_6019a714e521e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_6017c86705b16.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/1031c3d6-b9b9-45ea-92b4-361301027c57/how_to_install_first_alert_9120b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eec700c-a2e0-400c-abdb-991c0223e178/kala_patthar_full_movie_watch_online_youtube.pdfIn PDF document text
    • http://nikipafowur.pbworks.com/w/file/fetch/144893901/46488800607.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144455172/amiodarone_hydrochloride_davis.pdfIn PDF document text
    • http://buvulareka.pbworks.com/w/file/fetch/144826125/84875825370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156e5a9e-bcd2-4fb2-87d4-af6b7e38827d/skyrim_ps4_load_order_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d24f79-9c83-4e22-86c5-9225812442b2/83552062886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ccaff88-8a4b-46a8-9109-7fab13f1ca4c/vk_cartoon_cat_models_dc2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1008bae1-bd65-4b90-9f25-aa0cf1a68445/67607105929.pdfIn PDF document text
    • http://jowugaredite.pbworks.com/f/fuzaloteliralofimazine.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/145159731/lulubox_ff_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7f1585-8faf-49a2-b473-d08e2e369de1/macbeth_plot_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ba21c0-61af-4aca-b472-2b9ed4f46f83/boy_in_the_striped_pajamas_book_cover.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 5464 bytes
SHA-256: 2f1fa51dc25ab9fad5b1185978e726660cc3147264950a05514db10bb2971ebf
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 11120 bytes
SHA-256: 280ce6582f1cf1d25271cc666a53558d763742a8048b0e3798974dcb3fcd599c