Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d31cd947024b81…

MALICIOUS

PDF

78.5 KB Created: 2021-03-20 00:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b96ffaab7041b0f36400a6af409c63c SHA-1: 12ed6d09ed2072c2bad5448f053d71e51a4ce514 SHA-256: e7d31cd947024b81ccdaeb8a8e75c5ed9e1fb1b36899033c76f628cecb6c4e39
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://nipisod.ru/award?keyword=summary+of+the+legend+of+sleepy+hollow+pdf PDF link annotation
    • http://verefdliyvtorogo.xyz/gefimexoderunmqxwd.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/pofigojefifalekose.pdfIn PDF document text
    • http://vas-rem.ru/kutile0n9rc.pdfIn PDF document text
    • http://lnstagramsecurity.net/asus_rt-ac68p_manualf6a1x.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/ghawheE/advance_auto_parts_augusta_maine_phone_number.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/kefawigisonubulipera.pdfIn PDF document text
    • http://revujutipisan.22web.org/geburex.pdfIn PDF document text
    • http://xviiivbgz.com/fonavinetcf392.pdfIn PDF document text
    • http://vovpomnim.ru/55033989314fs5t5.pdfIn PDF document text
    • https://cdn.sqhk.co/toriwogadej/p6pkqQD/get_your_guide_berlin_reviews.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/a98f62fb-5304-4b11-8dd5-91bb4d6f48c9/technivorm_moccamaster_79212_kbts.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_21f3c518f81a4633bda824a3a40e86d9.pdf?index=trueIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_14e2de73c3ac4045a4dde8c037ef59fa.pdf?index=trueIn PDF document text
    • http://befadiw.rf.gd/sabbatical_leave_policy.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_3152d610cb8a40ad8cd2c49f6ae2dbb3.pdf?index=trueIn PDF document text
    • http://jafexobaxe.epizy.com/bunarukajikosidimugiwav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/653c6886-7a17-4e98-8404-ef951c1231ab/55296642366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ac6673-4c67-4700-9625-0f4788de71aa/nintendo_3ds_error_code_lookup.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/anemia_de_addison_biermer.pdfIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_f4da88889abf4b19810ed747561d4c73.pdf?index=trueIn PDF document text
    • http://ginokaze.epizy.com/16672625487.pdfIn PDF document text
    • http://famutiparuzot.epizy.com/magic_mouse_2_ipad_pro_gestures.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_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 5752 bytes
SHA-256: 6e4adfa4107ff86237cbd814953f13ea089f3e3201af451bf3bd47bd76204c1c
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 11080 bytes
SHA-256: a0b5b949a2adff51da7776ccb2a2b9dae1a66c3cf808e0842a86c63ef9e83507

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