Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d5df958bec0ad5…

MALICIOUS

PDF

82.3 KB Created: 2021-03-18 17:31:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5a0e6ef6a4e67391483c0408f4383878 SHA-1: 897c57102febce4255480a1b227896e699df569a SHA-256: 39d5df958bec0ad51c7efa4d2283b2acd753e5f9b5b8cf3cf101ad226adc9961
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://dugedepap.ru/123?utm_term=2015+ashrae+handbook%25E2%2580%2594+hvac+applications+pdf PDF link annotation
    • http://mrshadow.net/cours_liste_chaine_en_cusbfx.pdfIn PDF document text
    • http://leafester.online/dantes_inferno_2007_full_movieoa7vw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492593/normal_5fc9b7d3d3606.pdfIn PDF document text
    • https://cdn.sqhk.co/vovigewuva/Egdj7ja/robotics_toolbox_matlab_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5fd3ceaf1bf67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_601e157f8dc5c.pdfIn PDF document text
    • http://detonic-deutschland.website/duplicate_marksheet_du_sol82wpq.pdfIn PDF document text
    • http://bettermoneytips.com/how_to_open_my_gas_fireplacej8dwg.pdfIn PDF document text
    • http://prazdnikprosto.ru/how_to_study_for_ham_radio_license_testbmv6c.pdfIn PDF document text
    • https://cdn.sqhk.co/delobepaziw/djahiNJ/watch_minority_report_on_netflix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_60478f12ccb93.pdfIn PDF document text
    • http://13millions.store/vutadadous7sk.pdfIn PDF document text
    • http://smartradiobf.ru/sidililx7c1g.pdfIn PDF document text
    • https://cdn.sqhk.co/zutoruxutu/hdiijeR/whatsapp_call_recorder_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456119/normal_5ffef98458f53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d96a50f1-c563-49ca-a546-35880093982d/how_to_install_a_sump_pump_for_basement_bathroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2fda2d-df17-4463-8457-3645b6234f20/whats_better_gas_or_piston_ar_15.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 5680 bytes
SHA-256: d969c036767a7ec81433043f7d714478c1273487bd5de6ca63dedd81fce4e5a8
font_01_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 7644 bytes
SHA-256: 00d9382427fca2aab539a31c03b0e257fb21d54e464bd537f8f67d65dbd407ab
font_02_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 10624 bytes
SHA-256: f3f8a3775ba81a0f49c4e9b1e719c3b0cee21efcd584e759ab4d5c8ee849a269
font_03_sfnt_off00012ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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