Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74848bb1634c41f…

MALICIOUS

PDF

82.8 KB Created: 2021-03-22 13:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: db96334f8e1503010237fddb1bffc4f0 SHA-1: 07f3d8308bd692cbeb16b9e6ffce67631b7c58c7 SHA-256: b74848bb1634c41f58f75254ef10f360aaa3c5d495c99fcd8d52f0c9c4b88002
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent link disguised as a search result for 'how to find out if my gf is on dating sites'. This URL, along with others, suggests a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/aws?utm_term=how+to+find+out+if+my+gf+is+on+dating+sites PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424982/normal_603d20743fca3.pdfIn PDF document text
    • http://modarab.mygamesonline.org/tecnicas_de_busqueda_de_informacion_en_internet.pdfIn PDF document text
    • http://nafigunagofadab.getenjoyment.net/capital_requirements_regulation_deutsch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375070/normal_5feb7ac3581ec.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/439f7.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/jinogitabefodurepotu.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/2012_chevrolet_impala_ss_gas_mileage.pdfIn PDF document text
    • http://lipenav.mypressonline.com/kibajumezajimigefifigizow.pdfIn PDF document text
    • http://zebozewazogaso.scienceontheweb.net/gomebugasotusabogota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_60552644ab0c4.pdfIn PDF document text
    • https://zavadogo.weebly.com/uploads/1/3/4/3/134325895/ea7380b1.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://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_fd4f536d4b414d5f98c9f94ab95f92c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b960fdb-9012-4750-873a-ec696618c454/associated_laguerre_polynomials.pdfIn PDF document text
    • http://zujakogi.onlinewebshop.net/types_of_allelopathy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae88e3c-d0a7-4f33-aae8-179f18b55fa5/research_design_in_clinical_psychology_kazdin.pdfIn PDF document text
    • http://dilutibu.onlinewebshop.net/adobe_audition_tutorial.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_561d5c0d05cf4b3a89b2b7e28dc5fe43.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_774453d97ef04b3c942556671346f8bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e38b543-12cb-4a98-85bf-e2283603176f/kenmore_600_series_washer_lid_lock.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_89fcd8c131bf47e6ad3bac4b19d923ba.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_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 5136 bytes
SHA-256: 0b958ae55ddf11259ae84e4b5316a9cba83d78f457fb6f1aa60cda86aae669f7
font_01_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 11208 bytes
SHA-256: 57e9cdf935a4233609b9a3dd5c08e8315eec74a8754925d601e87cd3c52b9dab
font_02_sfnt_off00012ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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