Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d6c1ea0027d450…

MALICIOUS

PDF

72.7 KB Created: 2021-02-27 05:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d94917538f06f1c7cdc4cfe29732519e SHA-1: 136b0a74a4e4d6cd06b9478df5d4019d1555a17f SHA-256: f7d6c1ea0027d4509da749ecf4922380c06dcfb248f4e2a46e4b64d57b83a2c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=how+to+do+internal+audit+of+construction+company PDF link annotation
    • http://bosemefawixuwov.mypressonline.com/how_to_check_injector_pump_pressure.pdfIn PDF document text
    • http://visatog.22web.org/golitigevebajaritasedesef.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/fuwibuf.pdfIn PDF document text
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/0941e3b9f27c2b.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/jepikakuj.pdfIn PDF document text
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/58d4e.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/89115737562.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/how_to_pay_a_cell_phone_ticket_in_california.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/1768921.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/welofewo_lewebovekid_dutej.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/the_expanse_season_4_episode_10_wiki.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/how_to_tell_what_personality_type_you_are.pdfIn PDF document text
    • http://mojivoposo.iblogger.org/windows_7_bootable_usb_free.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/sekinajurefivi_tuvurom_wuguzuro_xisan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzivapevof.epizy.com/ragnarok_m_assassin_cross_leveling_guide.pdfIn PDF document text
    • http://suxuxuned.epizy.com/33348784138.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/autocad_commands_list_2019.pdfIn PDF document text
    • http://tovedevekep.rf.gd/24824908868.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/why_does_my_polaris_280_run_on_its_side.pdfIn PDF document text
    • http://nadedafusefemej.rf.gd/vba_search_all_sheets.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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 5456 bytes
SHA-256: 32c0d570865ca90c0b81f1352fa5d0a00d1187587a24a85f990cf9873a3acc23
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 10236 bytes
SHA-256: 420fee7064604939be2f969c35ed004c5a08cf015fdfcfdab67288de097401bf

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