Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cafcd2db1127ae…

MALICIOUS

PDF

81.7 KB Created: 2021-05-02 21:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 42e90b12bcff1a6daec3994ab80007f7 SHA-1: 2c834a63d72285d529c8fad57b39c665440cd3fb SHA-256: 74cafcd2db1127ae169d2916603d08e94d57953ac011ad1d07e26205bc49eadd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive link farm point towards an attempt to exploit users by directing them to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=sales+call+report+template+excel PDF link annotation
    • http://bapatavusirave.mygamesonline.org/where_is_bluetooth_on_samsung_smart_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483361/normal_605308a6236df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_600de9aeb77a0.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/classical_guitar_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379369/normal_5fede8baa69ed.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/dajukusodov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408195/normal_5feb94017111f.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/universal_themes_in_literature.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_606e1bfc2952e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477651/normal_6037c940cdc83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_6046b631a5fc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_2e25812eba0440819f9beb65814bc83f.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_5e20518f2fb34c5d93004fbf2ef9c78a.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_019ff3f126804ddb908215267b37d58a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db13fa1-b842-48e0-9c53-b19eb9059d61/instalacin_de_gas_natural_en_viviendas.pdfIn PDF document text
    • https://87deab66-c645-46c6-955a-dbc2758d34a6.filesusr.com/ugd/302fc9_fe7509c6c50c4190bc726ead92b854f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61394469-8941-4784-a208-0146b4904759/how_to_build_a_low_maintenance_home.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_4b7a16804d074613926cbce51d701d28.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_8396cca1574542ccbb2d61a0c0012705.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_bbf582f214254a4dbfab66c0d10ab59c.pdf?index=trueIn PDF document text
    • http://xutenujute.myartsonline.com/simple_audio_amplifier_circuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12425414-455b-425f-9ebe-3bd9808cac6c/rupajafinolajojonofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7eda35e-2d78-43f1-8359-c370feeaff74/89728030036.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_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 5252 bytes
SHA-256: 5962893156d73b2f5b080a9e0c6348bcf45fe4a51dd75a82dc0d8eeb4683cec4
font_01_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 10788 bytes
SHA-256: 251593ee1c7bd53e789f1e8826711edfcfa85043196fe3c89b1ad05864e8efb9