Malicious PDF — malware analysis report

Static analysis result for SHA-256 9431fac08adbc12f…

MALICIOUS

PDF

94.3 KB Created: 2021-03-21 11:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6aa9cab9efc60797c5508d4d27de3bad SHA-1: 10618b3407f7b33ff32377b64ecb6783c69180ba SHA-256: 9431fac08adbc12fbff91d720d90ad254f701f6304d107da3a3ea8ec56488743
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains multiple external URIs, including one pointing to 'kuzutuzo.ru' which is likely part of a phishing or malware distribution campaign. The heuristic 'SE_URGENCY_LURE' suggests the document content attempts to create a sense of urgency to prompt user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/award?keyword=assessing+listening+pdf PDF link annotation
    • http://sotowalef.22web.org/22992719896.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443823/normal_6001311fcd744.pdfIn PDF document text
    • http://topvideo.design/singular_and_plural_nouns_worksheet_for_grade_2z5yjw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_6017038c1df3b.pdfIn PDF document text
    • http://ideal-it.fun/zelipuniguzinoteqf7dl.pdfIn PDF document text
    • http://frut-tree.site/jeep_grand_cherokee_2014_manualh187f.pdfIn PDF document text
    • http://mainsale.pro/rezesofavatatawamavetabhngxw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496585/normal_5fe405f75c8cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375093/normal_600345da63735.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/ec75bc5c-b86f-4511-b80a-95f6ec52a66a/91586608848.pdfIn PDF document text
    • http://voxotili.epizy.com/lupibavekujogevumewa.pdfIn PDF document text
    • http://birijigasexow.epizy.com/felejesoxenax.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/demon_hunter_diablo_3_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65891157-b0b1-4e87-9e77-f586e0bc880d/logitech_harmony_remote_software_mac_os_catalina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a52851-03bf-4fd4-b621-f54949629963/what_does_chaos_mean_in_spanish.pdfIn PDF document text
    • http://xozodijavoxovun.epizy.com/when_parking_downhill_in_a_car_with_a_manual_transmission_you_should_park_with_the_transmission_in.pdfIn PDF document text
    • http://fixowix.epizy.com/hodder_education_workbook_answers_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/carrier_02xr_chiller_manuals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073770a0-ff39-45d9-ab2d-82123c63963c/sears_shop_vac_filter_17884.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/xifigoxedubajobogofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26096d6e-6f6b-4343-9c83-666d12968828/6054353652.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_off000134c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C5 4892 bytes
SHA-256: 447d4699236c1c0a35766d1e7157a945442a6e5e4f3a5cbb69e18608d5c8af33
font_01_sfnt_off0001458a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458A 11332 bytes
SHA-256: fea23ffe449a5addee50ddb8caff092e94c9c03b70a8b32f9aadf044e120f91b

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