Malicious PDF — malware analysis report

Static analysis result for SHA-256 5554f8b1f65730bf…

MALICIOUS

PDF

76.9 KB Created: 2021-03-22 09:35:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b73a8017875261a3c6855b28267f06e8 SHA-1: bb8d65b38d03a5527acacfde10f1325bf63173cd SHA-256: 5554f8b1f65730bf034d505ea8d86517d03acd938fe8cef4e506f302a6946795
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://seumenha.ru/strik?utm_term=bluejacket+dc+happy+hour PDF link annotation
    • http://arenaprobet.com/cobra_29_nw_ltd_classic_troubleshooting5af7a.pdfIn PDF document text
    • https://febixitojujemo.weebly.com/uploads/1/3/4/4/134402622/vadisosagupire_volet.pdfIn PDF document text
    • http://teachersaid.fun/golf_buddy_wt5_price0f621.pdfIn PDF document text
    • http://naturebiolog.space/natakasavezosareeixu9.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/4057445418nho2r.pdfIn PDF document text
    • http://com-signto2.xyz/concours_castor_informatique_2018_mathmatiquesyoqhd.pdfIn PDF document text
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/roditibixed.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/6964037fc.pdfIn PDF document text
    • http://drovazvenigorod.ru/define_attested_formk1jnn.pdfIn PDF document text
    • http://alisaborodaenko.design/273873497833lxls.pdfIn PDF document text
    • https://gixajime.weebly.com/uploads/1/3/4/7/134745735/8579939.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
    • https://uploads.strikinglycdn.com/files/30a97181-b83e-4dd6-abb8-2af1007b402e/bimivokorabozorenod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c09932-5635-4e35-828a-51266c097dc8/vijojesut.pdfIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_118c34e98532404188db3a8328af159f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f786b0-5eda-43a7-8544-2df799e5755f/plantronics_bluetooth_headset_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bc8aa6-4ac1-4859-9a01-cb9e9d7c7d39/pezemoritubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59efcb90-c5f2-44a9-b582-2347cc04ea8e/lights_out_2013_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34042b57-e561-416b-bdde-31e0c5fb8c6a/28368739809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18934e36-1b85-4bc9-ba4e-34e0e1b21e26/what_happens_to_air_density_as_temperature_increases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/477179b0-3bb6-4fa5-bab2-1e1955109aa6/calorie_count_sonic_chili_cheese_dog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b86ec2f-0f97-48d3-82c5-c467e4bc1ddf/kupowiwimosakaros.pdfIn PDF document text
    • https://ecad98c5-3f79-4b5a-9309-7060426a101e.filesusr.com/ugd/66ec94_c1d691d9c10b486dad5d79c25ba1ba49.pdf?index=trueIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_3dc7a19c7efe4c98a0158fdba37d0e90.pdf?index=trueIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_8f23ad94438b4498b591ade67556eb3d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 5000 bytes
SHA-256: 06c55e6e9a344f79a5b1833d941d3559c0d47e5388c75c0b0caa31c358bddb6b
font_01_sfnt_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 11868 bytes
SHA-256: fd2947f3fd83ac4183f51249f9f02b82d50518714c826ab6282d723964e5f4b1
font_02_sfnt_off00011858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11858 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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