Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae6505deabf6fbb…

MALICIOUS

PDF

84.7 KB Created: 2021-04-08 08:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c1427eee83a31d1e34ac6e7d941ed71a SHA-1: 5ff909f1ce980ee6e775c4ed267abba478e45cc9 SHA-256: 9ae6505deabf6fbb53985edd91380e4f036653db516adc0ec70d1c38d26ee8b9
186 Risk Score

Malware Insights

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

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=actividades+de+espa%25C3%25B1ol+para+segundo+grado+de+primaria+pdf PDF link annotation
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/butivexa_seketisowamon.pdfIn PDF document text
    • https://pusosisuko.weebly.com/uploads/1/3/6/0/136094517/5546275.pdfIn PDF document text
    • https://giriwegulajujup.weebly.com/uploads/1/3/4/3/134320738/keduzudabuzilu-fasasada-dakawiv-naluzi.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/pool_exercises_for_lower_back_pain.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/adding_and_subtracting_integers_on_a_number_line_worksheet.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/jifurodewa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sejipisuxus.rf.gd/generador_savonius.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/82071643242.pdfIn PDF document text
    • http://loxosonupod.rf.gd/1921492413.pdfIn PDF document text
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_9271c48561b34a1bb5d1ba4defd7c943.pdf?index=trueIn PDF document text
    • http://zareguzoveral.epizy.com/patofisiologi_atresia_ani.pdfIn PDF document text
    • http://dakawarinuku.epizy.com/cricut_cartridges_gypsy_hack.pdfIn PDF document text
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_e0c3b8bff5424762941cc2c857abbb7a.pdf?index=trueIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_bdf0782d523e400fa5549fef697c370f.pdf?index=trueIn PDF document text
    • http://rovututuxopi.epizy.com/jirevopujesisokinezuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/cheap_custom_trucker_hats_no_minimum.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/99928127217.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_9a73062d7ed54252a6f1c4e360eef8ff.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_f0c5a8d9fed64457a86fecdde48b97cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gosete/aerobatics_performing_arts.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_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 5736 bytes
SHA-256: f91f74b5ea20e1d7bf38969fa959da1051c98ca749cfd25f3b182460689e95c8
font_01_sfnt_off00011b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 12144 bytes
SHA-256: 1146a822a5f5f83ab754e334f5b1afa6d3683e8673148df70fc1aa47ad9b386a

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