Malicious PDF — malware analysis report

Static analysis result for SHA-256 73dd0607954a465d…

MALICIOUS

PDF

92.5 KB Created: 2021-04-07 13:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 66e00ca186e51b0ad14cd38e030680d9 SHA-1: d684beb171ba3f92b42d9e4b60d0fab33fbc4786 SHA-256: 73dd0607954a465d404875fb7e44d26ea5002faed94ef09c69da44b37aeb6259
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=financial+plan+for+startup+business+pdf PDF link annotation
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/jefufibirelozu.pdfIn PDF document text
    • http://xivobivivupe.mygamesonline.org/alopecia_areata_incognita.pdfIn PDF document text
    • http://gudutisiluzew.mypressonline.com/25738541345.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/jawisivepaxexebura.pdfIn PDF document text
    • http://ruwosiju.getenjoyment.net/foundations_of_algorithms_5th_edition.pdfIn PDF document text
    • http://zesigosaf.22web.org/functions_of_distribution_channels.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/gjzigjg/32037128422.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/the_canonization_summary_stanza_wise.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/vogebjd/bus_subway_runner.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/ghgjgip/kapikewi.pdfIn PDF document text
    • http://guzoseta.getenjoyment.net/maxabozufufabewufumi.pdfIn PDF document text
    • http://seweripuwas.mywebcommunity.org/afghanistan_war_history.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vebusatoro.atwebpages.com/wabotez.pdfIn PDF document text
    • http://rolubumemetujin.atwebpages.com/gapenatamez.pdfIn PDF document text
    • http://kisutajanarij.rf.gd/database_commands_in_sql.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_cadbb7cdaf224d8c8236f2b327e3c30f.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_ccd98b558140428b97a4aecfc04a0e53.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_68fbbd1118ca4644ab913b03d5391e36.pdf?index=trueIn PDF document text
    • http://gajutar.onlinewebshop.net/66707160750.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_4100525bcb9a4a17b401900e3eb0358f.pdf?index=trueIn PDF document text
    • http://pazepoxi.atwebpages.com/ielts_answer_sheet_2020.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 3268 bytes
SHA-256: e87d7be67cad8f47b62ed5c6627f7d091ccbff4cd23acdce3acc002839c14b12
font_01_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 5244 bytes
SHA-256: fd00303108fe49f730684ba6eef8feaeb23393670b7f486dece5aec54684e501
font_02_sfnt_off0001270d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270D 11492 bytes
SHA-256: 35e5ba21e2df2a113e420938a40202d91ec26466e1dc5ebb96785f2a84cc66ea
font_03_sfnt_off00014e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E88 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501