Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fce3bbb0d6e651f…

MALICIOUS

PDF

72.9 KB Created: 2021-03-29 17:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b1ae96cc63cb4346a5515c3aa641bb57 SHA-1: 92ebccd4fdcddaaf0ed862246b32adb21d63d003 SHA-256: 8fce3bbb0d6e651fc1bcc3a37104761f0b6eb0192cc1dc7bf34bec3af8a5a7ab
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://kuzutuzo.ru/123?utm_term=chiranjeevi+audio+songs++telugu PDF link annotation
    • http://vittorguxx.site/all_sat_practice_testshg9yx.pdfIn PDF document text
    • http://buloshnaya.site/vpn_app_free_for_macxvmfr.pdfIn PDF document text
    • http://astropsychology.website/private_guided_tours_vietnamuh3gb.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/a2eea2.pdfIn PDF document text
    • http://drive4mclaneaustell.com/yelp_review_content_guidelinesxqe3u.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/nigatubareku.pdfIn PDF document text
    • https://gazisaki.weebly.com/uploads/1/3/4/3/134371182/e05c05e7.pdfIn PDF document text
    • http://udilische.club/jirewopupenikaxukn2rne.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/difozorizebojafar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://totajenu.epizy.com/railway_bharti_2019_online_form_maharashtra.pdfIn PDF document text
    • http://gevalej.epizy.com/nidesejilijapenigukog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acbb550-1e5b-421e-979f-841aefdb6c3d/where_is_cia_training.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/32715479156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e08ff5-336e-4234-9f5b-81701a53393f/81850254654.pdfIn PDF document text
    • http://xizokenimufewom.atwebpages.com/allluia_psaume_117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8403cbd1-6d52-42c1-8d0e-69ad552617ee/62433075640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9f1ac5-2dae-4df6-b1e1-48c9eb0b660e/tulogawotifonimaguniza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5636a3e2-010d-4a0f-b415-87803661034a/gre_math_practice_with_solutions.pdfIn PDF document text
    • http://kebanibaru.epizy.com/aus_vs_eng_4th_test_pitch_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27ee5be-cabd-4e27-abfd-dcb0840c7f99/how_do_i_unblock_a_number_on_my_panasonic_landline_phone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 5128 bytes
SHA-256: 28677d74617a0fff1c145e41607383dff5a01d2a4a969b062f0f7232f53ab742
font_01_sfnt_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 10412 bytes
SHA-256: b83e20edf0821d20e00a1cfbea27a7eb2a18dda236015cc8b3585791bd9594fe
font_02_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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