Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf3deb5ccad3b2a…

MALICIOUS

PDF

72.4 KB Created: 2021-03-09 18:14:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b789b8d618e6d9f6a2a23297676d8d2c SHA-1: 182b37c3c2cc77e29a8c72fe14c04ddb2cd58ea1 SHA-256: fcf3deb5ccad3b2abe887a07868f4b55d66418cc7bd7e7af2fd6877cea3482f0
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 0.9993

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://xezojetit.ru/award?keyword=exercise+physiology+textbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392442/normal_6023389ca7549.pdfIn PDF document text
    • http://price-list.moscow/rabox9n4ok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_60349a47d4e9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_603a9b9180dd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_5fff7c7a1da58.pdfIn PDF document text
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/fovefanu.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/conversor_pulgadas_cuadradas_a_metros_cuadrados.pdfIn PDF document text
    • http://idealicaitalia-official.site/mevogefibokenunobinabetay4tb8.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/anker_bluetooth_keyboard_pairing_code.pdfIn PDF document text
    • https://luredirimepopes.weebly.com/uploads/1/3/4/5/134590269/8427687.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/wupekibuwe03b.pdfIn PDF document text
    • http://sfhgfje5df.xyz/2017_peterbilt_337_owners_manualoprso.pdfIn PDF document text
    • http://ilkertr.shop/xibipaxazulerogizune2q2k4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_603f6a6ebe1f7.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/271cadf0-d204-4433-b3f2-3de682e46f83/mozibolejotizitunenep.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_e9945caf4a3f4346b74ebf00c96b9354.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_eb1b780c005a4c9f87d4876a213a46b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/581956ef-f90b-4e78-8c02-9b37ea40e752/business_english_idioms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4971b44a-e21a-416d-ae23-a2f13cf82d0c/31133057583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a761ea-2229-4391-b65c-198550a85091/fekuj.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_e8ed987af4dd46fdb8d5c1c8e5541e92.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_40a97b660f3f4250a73efc8eb9396dc1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc24719-3bf6-43be-9222-7e8cae65af45/simple_present_exercises_with_answers.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_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 5536 bytes
SHA-256: f5f10e8f4439c75b1a9e8524ad73d3afa4b52ed62931a862cf1e4934e77590c1
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 10052 bytes
SHA-256: e7c020af9cc64c4532b3cf2b43b21e83cf03e87b9ea3d0f6a7a5d96f06adc1b1

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