Malicious PDF — malware analysis report

Static analysis result for SHA-256 647c72ecd4feb1c1…

MALICIOUS

PDF

73.7 KB Created: 2021-03-16 08:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ffeaba13f80d59feb78b0c5224cf23 SHA-1: eb5f7ef276ada047f24a33d0081c8eefa1b348ae SHA-256: 647c72ecd4feb1c14bca8e815c91666b9134fd0ced036b27105d7bd1e69f0ed4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking documents, but one suspicious URL (https://gimoguvi.ru/123?utm_term=awadhesh+premi+video+2019++mp4) is present. This suggests the document is part of a link farm or SEO manipulation tactic designed to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/123?utm_term=awadhesh+premi+video+2019++mp4
    • https://cdn-cms.f-static.net/uploads/4473632/normal_60220c2214a39.pdf
    • https://cdn-cms.f-static.net/uploads/4408464/normal_6019c69907943.pdf
    • https://rewegabelera.weebly.com/uploads/1/3/5/3/135390500/373454.pdf
    • https://static.s123-cdn-static.com/uploads/4366034/normal_6002617a9ff4a.pdf
    • https://bevarari.weebly.com/uploads/1/3/0/7/130740456/6330271.pdf
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/5266691.pdf
    • https://fuwurukuzubefek.weebly.com/uploads/1/3/0/9/130969433/revewiz.pdf
    • https://cdn-cms.f-static.net/uploads/4490974/normal_602c1e81e1845.pdf
    • https://dukuvewag.weebly.com/uploads/1/3/4/0/134041028/6992441.pdf
    • https://jebelobuf.weebly.com/uploads/1/3/1/4/131452997/gawiwanolamisa.pdf
    • https://xunilizavokuniz.weebly.com/uploads/1/3/6/0/136050149/bb4368ede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/vudivuzakal/star_ocean_anamnesis_reddit_apk.pdf
    • https://s3.amazonaws.com/juvetaso/free_powerpoint_template_research.pdf
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_e45d3e0fa943402c8bb5cc66afccbd07.pdf?index=true
    • https://s3.amazonaws.com/fotojipifuzitul/nukajobujebipabigot.pdf
    • https://s3.amazonaws.com/mizeteb/cipherlab_8000_scanner_manual.pdf
    • https://s3.amazonaws.com/matogapibelifiv/fubewurofedexukufuxega.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_d410d31400df4514b32bbbd60a0b964f.pdf?index=true
    • https://s3.amazonaws.com/xifabilejilab/tuesdays_with_morrie_summary_book_review.pdf
    • https://s3.amazonaws.com/lezerawe/99853729701.pdf
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_a3f7e293eafe4fdcaaf0ced44799def2.pdf?index=true
    • https://s3.amazonaws.com/xarojapi/castle_ravenloft_map_pack.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d535.bin
412aa3f5b79ef07db5005a425c94e070666955c4822a0d7e24404c948fa2bf5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 5880 bytes
font_01_sfnt_off0000e92d.bin
1a61ea026dd6f8a74ef67433d99d54be6d34138e3f6f4f25ec9d9a0542059156
pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 10024 bytes
font_02_sfnt_off00010bd5.bin
89aba0fd176136cd5e5f6d84135b79d48793bd5d8bd5309ab8c4df658acf109c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 3420 bytes