Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e39c13de2739bfb…

MALICIOUS

PDF

80.2 KB Created: 2021-03-11 12:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0197e7219ccdab1b641813002cd4f7d8 SHA-1: 901ee882fdda439f8162a89e0764ac273f312e2e SHA-256: 2e39c13de2739bfbb53001560db5185d601519ee4725d9e92560877d7a718e0b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links, some pointing to disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to malicious or phishing sites, likely distributed as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://resalured.ru/123?utm_term=mod+apk+resident+evil+4+android+lollipop PDF link annotation
    • http://worameruvejaka.mywebcommunity.org/sulabufoxuru.pdfIn PDF document text
    • http://wabaxifejem.sportsontheweb.net/88461642708.pdfIn PDF document text
    • http://xuvepawa.iblogger.org/vujuwosowukose.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/how_to_cite_a_article_in_apa_style.pdfIn PDF document text
    • https://tuberosaguxe.weebly.com/uploads/1/3/1/4/131437792/ceb90a605556d29.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/vamagukiwakunusu.pdfIn PDF document text
    • https://vidamizumowi.weebly.com/uploads/1/3/4/5/134598026/zolimafarudakod-venex-xasesot-givop.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/lixuzawugozisovazesiraga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/73610e3f-ec5d-47b1-9ff6-f103e9ac840a/merax_crazy_fit_vibration_platform_fitness_machine_2000w_with_mp3_player.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/how_long_to_cook_rib_roast_in_rotisserie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0201ff0c-d3f3-432c-ab36-628df435d42d/texas_cdl_renewal_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db5f21d-f385-45c4-a092-4c5282b912b7/kuronuxuwagitatululimem.pdfIn PDF document text
    • http://giwaxavuf.epizy.com/kufofixutop.pdfIn PDF document text
    • http://kadizilurojiniz.onlinewebshop.net/stairway_to_heaven_backwards_lyrics.pdfIn PDF document text
    • http://nabowiruxurupob.rf.gd/bmj_case_reports_images_in.pdfIn PDF document text
    • http://fovafujunav.epizy.com/foferukozi.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_852217f9625f42fc84c2ab281c0c29f1.pdf?index=trueIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_24c5e6700faa4d52bd60f907e3b5eda6.pdf?index=trueIn PDF document text
    • http://zepuwiz.atwebpages.com/do_you_charge_tax_on_a_restocking_fee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa87119b-8ed9-4001-89ab-441e0225f273/rufetapob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32416d1-77a8-419a-84f5-ffac203702f1/losovumurexukiwev.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 5168 bytes
SHA-256: ffb5472e1e5150f3f8174dfdf05284fa956afb258bcfb1edc3fc62f4802bc4d9
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 14484 bytes
SHA-256: 59378b1037dd274044b3b699ad34dc2d3eb41ad5843b965c4c87e630fd0c9441