Malicious PDF — malware analysis report

Static analysis result for SHA-256 4629d65abe30ce99…

MALICIOUS

PDF

78.5 KB Created: 2021-04-03 17:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d46419f53cf322e61b45b6ac43e4de3d SHA-1: 9abf5a1881741cda89d2127673f1f2758a387075 SHA-256: 4629d65abe30ce998e88ec0575258f06a30a299486450749e3045b952636e484
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 of which point to other PDF files, indicating a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or trojan delivery. The embedded URLs and the PDF's structure are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=600+essential+words+for+the+toeic+3rd+4th+pdf
    • https://cdn.sqhk.co/luwesefizi/jhjehfh/roxifagipisumojo.pdf
    • https://cdn-cms.f-static.net/uploads/4490367/normal_603d435af0439.pdf
    • https://senabexe.weebly.com/uploads/1/3/4/2/134265557/8d735a4d00e2be.pdf
    • https://cdn-cms.f-static.net/uploads/4371269/normal_601976de9871d.pdf
    • https://cdn.sqhk.co/xudekutof/ihwjgjg/54916031665.pdf
    • http://zoosalon.org/forevusow65z2h.pdf
    • http://se-mrush.com/wallpaper_iphone_xrggy4e.pdf
    • http://tertov.xyz/81522893085bnhks.pdf
    • https://cdn-cms.f-static.net/uploads/4478687/normal_60581b21ec88f.pdf
    • https://bejokuwawij.weebly.com/uploads/1/3/4/6/134688199/5e91fabcb9.pdf
    • https://cdn-cms.f-static.net/uploads/4416322/normal_6033a61513e77.pdf
    • https://cdn.sqhk.co/gilubibawi/jghiG0R/jubakexobarix.pdf
    • https://videxopefofima.weebly.com/uploads/1/3/4/1/134131768/jajepudoxuxizif-gonisafurixasid-jafevagaja-xenupel.pdf
    • https://vipekisurular.weebly.com/uploads/1/3/1/4/131453387/katenirupaj_zegipidelariwe_boxoj_lemoli.pdf
    • https://cdn.sqhk.co/togokitaz/aibOifX/child_care_network_michigan_ave.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f19cb03e-d2f8-49cf-a1b7-71009948a339/is_ninja_foodi_a_good_air_fryer.pdf
    • https://uploads.strikinglycdn.com/files/8b309fab-42f9-4210-89d6-5130137db0cf/jezezesijelapumuxesirakup.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e624.bin
914cf17d116a7b29d3edfaf03225053f570ec55a7bac885eb5445231b50f8bee
pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 5788 bytes
font_01_sfnt_off0000f9e7.bin
274ce8e1012ecef5469cf4486ad59ad15e89bd43e014f9d39fba6cebcb614e72
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 23084 bytes