Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b590d7bbee459de…

MALICIOUS

PDF

81.3 KB Created: 2021-05-20 04:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1fe1824052be3c4417920c8f6f83190 SHA-1: 7220c4110b66cbde8a39002ad4eceed687dd33d3 SHA-256: 4b590d7bbee459dea533358fe608305a976b334a954bcc765f68e5ec75cf4263
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 are likely part of a link farm designed to manipulate search engine results. The primary external URL, 'https://xezojetit.ru/wb?keyword=12th%20grade%20sat%20vocabulary%20list', suggests a phishing or scam attempt by disguising malicious content as educational material. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wb?keyword=12th%20grade%20sat%20vocabulary%20list
    • https://cdn-cms.f-static.net/uploads/4418778/normal_602508b8bae32.pdf
    • https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/gojose.pdf
    • https://wuxinafub.weebly.com/uploads/1/3/6/0/136084542/7126029.pdf
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/3281830.pdf
    • https://viluvaxev.weebly.com/uploads/1/3/5/9/135974466/jumigefetirewam.pdf
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/rugafugeva-sulixewavub.pdf
    • https://static.s123-cdn-static.com/uploads/4490754/normal_5fc5fb25ca8d8.pdf
    • https://zexajupa.weebly.com/uploads/1/3/4/6/134692079/sasisigunekex.pdf
    • https://torurukiruxo.weebly.com/uploads/1/3/4/5/134529807/zedixe_fipedebitalu.pdf
    • https://cdn-cms.f-static.net/uploads/4387702/normal_6023e4638185a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6cc982ef-a274-41d2-91ca-ce3efdbae3ec/duralast_800_peak_amp_jump_starter_reviews.pdf
    • https://uploads.strikinglycdn.com/files/20aec562-380e-4568-b178-39818a2396f1/5890211900.pdf
    • https://uploads.strikinglycdn.com/files/bd21b1da-1c60-49cf-86c0-541356b67b9a/live_stream_cable_tv_free.pdf
    • https://s3.amazonaws.com/libeganot/35482263866.pdf
    • https://uploads.strikinglycdn.com/files/6a8a29f8-cd62-4794-80e9-427bde908145/dutimopijajenokugizux.pdf
    • https://uploads.strikinglycdn.com/files/52d9cf36-bb5f-4ec1-a002-811335d22e04/2008_honda_accord_maintenance_minder_codes.pdf
    • https://uploads.strikinglycdn.com/files/cc7b94ca-3cc4-4cfc-9b40-31c52c5bf820/pifanakewumuzenew.pdf
    • https://uploads.strikinglycdn.com/files/c3392fb5-dfb7-4c96-8d56-dd61aa2c9782/which_dunkin_donuts_donut_has_the_least_calories.pdf
    • https://s3.amazonaws.com/fokapikow/36264301467.pdf
    • https://uploads.strikinglycdn.com/files/1a96934a-5f57-432d-b0df-77d77aef2735/kadidikabawexekapidurelit.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_off0000f27c.bin
5a17a73408d7149b2f29c6fe8b255892c619e47d5a96456ba0e3f628a6d44021
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 5368 bytes
font_01_sfnt_off000104e2.bin
779a774cdcd94ac55bc8bb6cbfb514594b39c23c2fc5ae8ef0a844395ae99397
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 10680 bytes
font_02_sfnt_off00012970.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x12970 4324 bytes