Malicious PDF — malware analysis report

Static analysis result for SHA-256 894e7633aa8523cc…

MALICIOUS

PDF

100.2 KB Created: 2021-04-02 14:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f60f02673212bd6d34e685c96ba9dbc5 SHA-1: dabb568186e04ecfbb0f1d28b74a4e920fa2ec5f SHA-256: 894e7633aa8523cc812e9deab48f846ff9c1d81728a6e242a8a529b6503cab03
164 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 dynamically generated and point to other PDFs, indicating a link farm and SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL and the heuristic 'PDF_SEO_LINK_FARM' point to the primary attack vector of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=here+i+am+lord+chords+ukulele
    • https://segurabo.weebly.com/uploads/1/3/5/9/135964373/lumifor_sobemomibov_pujinawaso_tufagusexelofo.pdf
    • https://juxeduwabup.weebly.com/uploads/1/3/0/7/130775558/vinupozatikuvali.pdf
    • https://cdn-cms.f-static.net/uploads/4403270/normal_5fe8dbc4d5d9b.pdf
    • https://gixebodaloru.weebly.com/uploads/1/3/1/3/131379223/4e7fe7f7.pdf
    • https://lopenedaxi.weebly.com/uploads/1/3/1/6/131606218/6a7cb66ede6d.pdf
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/kijokirusejamokano.pdf
    • https://cdn-cms.f-static.net/uploads/4476750/normal_5fd5fac261994.pdf
    • https://cdn-cms.f-static.net/uploads/4504788/normal_600fa56e4a857.pdf
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/4bb34e01070.pdf
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5fd61e3033341.pdf
    • https://cdn-cms.f-static.net/uploads/4447630/normal_602c33f7545b9.pdf
    • https://juregirezixo.weebly.com/uploads/1/3/4/4/134401856/mutipipizisuvawofosu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3a861350-d8ef-4575-b91f-80ef4f980bb3/24880934921.pdf
    • https://uploads.strikinglycdn.com/files/dbd105c5-67bf-41e0-91e8-9bfbe6d3dbcc/98401224869.pdf
    • https://uploads.strikinglycdn.com/files/e28deee9-72d2-4347-9103-8b6e76bfde8f/how_to_program_comcast_remote_for_new_tv.pdf
    • https://uploads.strikinglycdn.com/files/4d8b62e5-0fc0-494c-953a-7893f4b1e286/38359710398.pdf
    • https://uploads.strikinglycdn.com/files/660b414d-12cf-4475-b571-6dd38ea840e1/23458521129.pdf
    • https://uploads.strikinglycdn.com/files/28c6ee77-9ee0-4e05-b313-9d41e65e1fdc/97501409311.pdf
    • https://uploads.strikinglycdn.com/files/c71bdeac-ce36-4443-8ab5-52d1aab3791a/48542986887.pdf
    • https://uploads.strikinglycdn.com/files/8eae184c-eddb-436b-bac0-a9be5166039a/6985265559.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130d4.bin
a1da53932bd30b594650f917e646be723aed4db4749036feb5fbea7c74364715		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 5204 bytes
font_01_sfnt_off00014253.bin
fcbf87f52032032af60f3ab6d78a8dd7564630960616bd52723e631355661244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14253 13408 bytes
font_02_sfnt_off00016e39.bin
dffadf9df6cbf5a60d57fd1e1b48b3ad2afc4c8cd42d19f42a3eb74df09620b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E39 16076 bytes

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