Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbac1c6ceaf7524…

MALICIOUS

PDF

75.4 KB Created: 2021-04-21 22:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 088921067487ecaa55d03ff04363d0ed SHA-1: 5e1d0c9407f43c2d1d3cc1ce2df8b27d11d274f5 SHA-256: 4cbac1c6ceaf7524d6167bf08e4568f6971d9eff996625d593407503cf3f4f3f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=les+miserables+25th+anniversary+dvd+cast PDF link annotation
    • http://marketitaly.pro/on_course_3rd_edition_skip_downing_downloadcn7nt.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/Ojajdia/xezifulubanoxederorego.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/Hgeojek/hunt_skies_pixel_worlds.pdfIn PDF document text
    • http://apple-fruit.space/dream_interpretation_red_applesooa82.pdfIn PDF document text
    • https://cdn.sqhk.co/vomifavafo/mgcjdcf/mukipiwuwuj.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/fzUgggi/jovejulikiweseg.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/bjbhds7/zozidutolufudun.pdfIn PDF document text
    • http://health-top.ru/371849300456s7tl.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/hgeYggf/boo_radley_character_description.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/jehdolU/piggy_go_rewards.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/98ijhfa/puminafakakorup.pdfIn PDF document text
    • https://cdn.sqhk.co/juzexokogim/jNibEjg/throne_of_blood_full_movie_dailymotion.pdfIn PDF document text
    • http://top-shop-store.website/vamesapoz37qa.pdfIn PDF document text
    • http://legrand-spb.ru/583907480636ljfc.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/gcWjg7d/62408944359.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/0TijRhe/bezaliradugekav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_83807bebaaab4959abff504e1422e810.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_6d4dac1a9aca41819602cefd460f76d1.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_d8b0ee98ad3a4068b6cfdb591723ad3a.pdf?index=trueIn PDF document text
    • https://651f5d5e-5f42-4fb0-8380-889764ca350f.filesusr.com/ugd/b2f7c1_101af4d80f0f4a148047d6e3b9843064.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_b425b62060054922b6424c18cb53f7b8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 5676 bytes
SHA-256: a2438ab51f9659660ae4c5116bf5be18101aa9afad946564f969b206535d21f5
font_01_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 10632 bytes
SHA-256: 3afe97aa9469d401880fdd87149a5ec4f2482992f6efce1168fc14517b64810b