Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd85de238c236462…

MALICIOUS

PDF

77.9 KB Created: 2021-04-08 21:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f8d273ac11b0833eeb0cbc577abde944 SHA-1: 55b3eba6481fd65fce552786dce43b08c59e51fb SHA-256: fd85de238c236462a469fc40db2fbdaceefea028f04dc851f4ad958c8f7f8a82
156 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 0.9992

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 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.
  • 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://jottigo.ru/strik?utm_term=arris+dg1670a+spectrum PDF link annotation
    • http://zavuwoxek.22web.org/tegelosixopunaxepepidupot.pdfIn PDF document text
    • http://hookup755.fun/samsung_galaxy_s3_through_straight_talkjnmqt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476780/normal_5fe364a1a7bd5.pdfIn PDF document text
    • http://copyrightnotice-ig.com/maverevunipervt64d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_60241ecc04a63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_60647cfa20a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_605457924d907.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_89da50f4a3e34f1d888f1dce411bec23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozilum/voleraxovetevuwutabo.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/incident_report_abandoning_post.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6624df64-5066-4dc8-bea4-fe9493d5ca94/japanese_wii_u_change_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5999a4-71ec-4c33-9288-3fa8660f7fa5/homer_kelley_the_golfing_machine.pdfIn PDF document text
    • http://bexinoj.epizy.com/10621941222.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/adobe_photoshop_cc_2020_system_requirements_free_download.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_c7a64bd3435047a583986ebb81688bc6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somisilegex/vagiputasusaxegarefa.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_246c98240abc4bfa9f98216768b26b6e.pdf?index=trueIn PDF document text
    • http://nozulorot.epizy.com/andromeda_galaxy_picture_1._5_billion_pixels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1613c0b1-c9ba-4caf-a65d-da34033762f2/why_did_my_dryer_stop_mid_cycle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d7b6997-eb5a-4928-b0ed-c7359d9d49eb/unravel_meaning_in_chinese.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/vigazotusaf.pdfIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_9646708acada43e793d5c9a8cfe1363b.pdf?index=trueIn PDF document text
    • http://jawimazo.epizy.com/the_online_piano_tutor.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_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 5780 bytes
SHA-256: 6ad9610397f291016a7fe36167026f997ffe70bcb5645e8bae0b4a623815f013
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 10760 bytes
SHA-256: e089cda6e15e5e401f8884a737a23c21441c09fe604802e43779e689bd9d8ff8

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