Malicious PDF — malware analysis report

Static analysis result for SHA-256 897f38209f1aa438…

MALICIOUS

PDF

83.1 KB Created: 2021-04-10 10:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cae6a2f100813830c5532641ac93aa27 SHA-1: c21ac82bd4e37397d181b4ce7e1edcc1e4823647 SHA-256: 897f38209f1aa4389afaa219869bf848fe32f1be9b646df5811645ee76f4e4d5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though truncated and containing non-readable characters, includes a URL that appears to be a lure for specific search terms. The presence of numerous links on disposable hosting further supports a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=2001+chevy+silverado+1500+fuel+pump+wiring+diagram In PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491665/normal_6019f95d8456d.pdfIn PDF document text
    • http://arenaprobet.com/asp_net_mvc_video_tutorial_kudvenkat6stx1.pdfIn PDF document text
    • http://oyuncuxx.com/gajamuvawasotlmpoy.pdfIn PDF document text
    • http://lotto-investclub.com/230142234135ixae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460048/normal_605a922bf26ca.pdfIn PDF document text
    • http://woodbonus.net/the_iliad_of_homer_richmond_lattimore_download745uh.pdfIn PDF document text
    • http://genoray.pro/ramuturesexafuparokapefarwcih.pdfIn PDF document text
    • http://czecheducation.space/roxemovewulafomiweqvnv7.pdfIn PDF document text
    • http://vitrinachel.ru/badtameez_dil_mp3_free_download_320kmwtia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5fef9f1e606f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_d68c9de5b3c94376b759f71ca5208fbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95c1b24-f546-4a02-9f63-d8b82fc3ed05/batubiwepizeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f79660d-adb2-4ca5-ade1-aac2d006c830/gesozafovopifixifudo.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_110ccb2bfe134ce2a1d09879c3949995.pdf?index=trueIn PDF document text
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_f61957d290a64256aa9b4db8713d1197.pdf?index=trueIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_753be43682fb4b83b11e9545ea68cb70.pdf?index=trueIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_4a37f7665af64f05baf11cb178e9d802.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94c1316-17b8-4cb1-8b4d-41db805fc014/the_titans_curse_summary_chapter_1.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_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 6176 bytes
SHA-256: a4fa9ea5c5d8e048348c3ec8686fb9bebed422043e4ef1733bafbde97a22a0a2
font_01_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 10824 bytes
SHA-256: 466bca4ec077ff6143964236d96c75fafe39a9f549b5957395ccb37e1bdc3c24

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