Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3154813bccb6233…

MALICIOUS

PDF

88.4 KB Created: 2021-03-15 20:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1792b566aab30bcb4cba1643b9ffca64 SHA-1: 219d93b70ac376b6ee2e514dbbffe20441db3e1b SHA-256: c3154813bccb62334da6bb434f80bd506f02363c4daa87b1be21b22d7782f516
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 0.9997

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://baarspo.ru/award?keyword=antonia+fraser+mary+queen+of+scots+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369771/normal_601a56203748e.pdfIn PDF document text
    • http://parrrtner.xyz/gefipagoluwifosowulafuni4r3q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403270/normal_6025e3fc7c680.pdfIn PDF document text
    • http://1fps.ru/nuditafeleludevatetepex1cji.pdfIn PDF document text
    • http://buloshnaya.site/because_of_mr_terupt_book7fj31.pdfIn PDF document text
    • https://xoxekoxezugox.weebly.com/uploads/1/3/0/7/130738790/4332891.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/zumoselefofesa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5ffa776a65dfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_5fe370c29f0e6.pdfIn PDF document text
    • https://dujemezore.weebly.com/uploads/1/3/1/3/131381607/1619078.pdfIn PDF document text
    • https://siradukezud.weebly.com/uploads/1/3/4/7/134711866/8e9b2dfb5b0a139.pdfIn PDF document text
    • https://vekenotagiwupas.weebly.com/uploads/1/3/2/8/132815979/fefuwu.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/b050f939-465d-478d-b75d-528f2868303f/liwadomilabamaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daff8e2a-59bf-4f6a-b520-92feb118235a/23216900222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94701e3f-f15c-4896-8463-544edc9fa687/what_is_a_reference_release_form.pdfIn PDF document text
    • http://dazozelagur.epizy.com/7281913519.pdfIn PDF document text
    • http://zowuxepalaget.epizy.com/formal_notification_letter_sample.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_b58752406b664691bbbbe94942131e2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a0bcdd-a9a9-4de7-8b57-b5192b445074/jewom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc0b179-a7a4-439a-80f0-808b3c1d78a8/dedujidefolotedanu.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_46a9da016810474a806ad5c25625ca2c.pdf?index=trueIn 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_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 5488 bytes
SHA-256: a245f0a49ddee198e43af136c86bda3348a279ce073236746a8cf75b02448f3e
font_01_sfnt_off00012d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 11552 bytes
SHA-256: 34c1220df962d32d4747fd7db38f33250a0c0dea5fe10deedb45cfebf0eca135

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