Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9734ac4b680190…

MALICIOUS

PDF

81.1 KB Created: 2021-04-04 04:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 40cc7aaa290850a86a1e4a50aa93e7f7 SHA-1: c934fc21e859d83f839b403972be84642cb12f7e SHA-256: ee9734ac4b680190d8aa15277dc0048b356a1c45b6160c3352cc26d2f1c765e8
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains numerous embedded URLs, including one pointing to 'nipisod.ru' with a keyword suggesting a lure. The PDF structure also indicates it's part of a link farm on disposable hosting, reinforcing a phishing or scam objective. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/award?keyword=chicken+biryani+tamil+pdf PDF link annotation
    • http://copyrightreports.com/43611018206yrcwt.pdfIn PDF document text
    • https://cdn.sqhk.co/nobuwinulad/wgjacib/gina_guidelines_2019_slides.pdfIn PDF document text
    • https://cdn.sqhk.co/bipaneri/jfhdQgi/zubukekavajisironeseti.pdfIn PDF document text
    • http://wowovamofuzo.sportsontheweb.net/features_of_ms_excel_2020.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/xitusotanuzapasimeg.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/T6c9gjm/duvuvebet.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/kjeRRSR/61776182888.pdfIn PDF document text
    • http://itdiscounts.pro/84043114318hs8y9.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • http://matteset-spon.space/241454882727rxmw.pdfIn PDF document text
    • https://cdn.sqhk.co/retagigimusa/Rjbijjb/metformin_weight_loss_success_stories_pcos.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/what_is_the_gas_oil_ratio_for_an_echo_blower.pdfIn PDF document text
    • http://posebakuxosafod.getenjoyment.net/68498459489.pdfIn PDF document text
    • http://nuveclovet.xyz/vunur73b2d.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/laxati.pdfIn PDF document text
    • https://cdn.sqhk.co/pikuworano/onPhjhh/bubble_wrap_popping_addiction.pdfIn PDF document text
    • http://datingdate.site/678336119493wy43.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/2hjicjj/maxafeterobumilanojebarux.pdfIn PDF document text
    • https://cdn.sqhk.co/woguwubege/iiifidE/remaining_games_for_liverpool.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/Gia2TBg/30823188648.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/nhb9Z72/3ft_fish_tank_for_sale_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://vulopekusape.atwebpages.com/99387078711.pdfIn PDF document text
    • http://zipulosi.atwebpages.com/noxoretejixi.pdfIn PDF document text
    • http://zalatikewal.atwebpages.com/temperatura_corporal_concepto.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 5428 bytes
SHA-256: a0052a8f4403a4d3cff176dc82d517593ab6069d54fc45ed547f3ba2d553b416
font_01_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 5280 bytes
SHA-256: 76af637c87feeee508c3189625af9a208645a49fe31e47f62edce7fde1a7839d
font_02_sfnt_off0001131c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 9808 bytes
SHA-256: 78a5ee9587f39744eaf39417a087422d92c4ccf5c0aa7d312e87e03065b8fc07