Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd998f8773f3c147…

MALICIOUS

PDF

80.0 KB Created: 2021-04-16 09:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a4e7f48577d75c980cb2a0fd9fb9ebc1 SHA-1: e52f788d6b48522a89c0571fed00d48d0d5eaf5e SHA-256: dd998f8773f3c147eff2df1fd01b83d9bb59fac531013c912697f49f204bd7b7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection further supports its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=asus+dsl-ac68u+ac1900+modem+router+review PDF link annotation
    • http://bupimobim.sportsontheweb.net/book_blink_malcolm_gladwell.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/66275442296.pdfIn PDF document text
    • https://dowililob.weebly.com/uploads/1/3/4/5/134518502/figoropamoserokexe.pdfIn PDF document text
    • https://durirumis.weebly.com/uploads/1/3/3/9/133999752/zegetedaninenenid.pdfIn PDF document text
    • https://vilejote.weebly.com/uploads/1/3/4/6/134629871/lixagobatobog_posewijupi.pdfIn PDF document text
    • http://zegobudipaju.mywebcommunity.org/bahrain_world_trade_center.pdfIn PDF document text
    • https://nesaresivegixan.weebly.com/uploads/1/3/1/4/131453215/1356104.pdfIn PDF document text
    • https://vimasideb.weebly.com/uploads/1/3/3/9/133997972/50d5faa7dcba.pdfIn PDF document text
    • https://wesobopaforok.weebly.com/uploads/1/3/5/3/135311180/jopasogirirujedupig.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/thermocouple_calibration.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/nejunim.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/why_is_my_deep_freezer_not_working.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/f42c415c-89b2-49bc-9e01-a5c5412b8e3a/craftsman_air_compressor_33_gallon.pdfIn PDF document text
    • https://43e59f28-96d7-4988-bcd6-55bc25f76e69.filesusr.com/ugd/372bdc_f9edccb64ab64fd9a9e4c1f6dcbec0ad.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_66711f1531b34084a1ae13f7cf36d414.pdf?index=trueIn PDF document text
    • http://rorazizaxaf.atwebpages.com/khng_m_c_file_trn_web.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_ca20caa065c441648c02837fed279c80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4a20e5-7d01-4c6f-b6c0-c88f8e849f2c/85218971615.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/reversing_secrets_of_reverse_engineering_1st_edition.pdfIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_d821fa3190784eb99d15ab4734da155c.pdf?index=trueIn PDF document text
    • http://lijowavatajo.myartsonline.com/sinafukomexu.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_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 5956 bytes
SHA-256: b9dd42179f1326989d52846024d5677ab3cebd82cc8a5d731be5b43d0803ecbd
font_01_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 12508 bytes
SHA-256: d2cb01d2e8ef5a6698bf48689c8b27b79589aee951c410e05f7ed7af872ff9df