Malicious PDF — malware analysis report

Static analysis result for SHA-256 da18d181665d9515…

MALICIOUS

PDF

81.3 KB Created: 2021-03-25 09:19:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a2ed4de8c96c58edc7ef576cc7aed986 SHA-1: 6606c1a458c1e54bae63b6fb52988069d01d79bf SHA-256: da18d181665d9515ea8c08533f1e1b66477631f1e6727af45ee383240740501b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially untrustworthy sites. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics suggest the document is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=starfall+calendar+november+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426423/normal_6007575f93c1f.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/cEgehhJ/worship_music_about_peace.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379474/normal_5ff2dd85b4799.pdfIn PDF document text
    • http://xovitexi.iblogger.org/exploring_psychology_in_modules_9th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/7gcT9QU/sharpened_volcano_fragment_chemistry_set.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_5fe9e089962fa.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdfIn PDF document text
    • https://cdn.sqhk.co/vanujapuduti/g61X3QS/flat_guarantor_letter_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_604fcf08734e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497095/normal_5fc85fba06c83.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/97551730835.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dovudegumigisaw.rf.gd/30_minute_strength_training_workout_with_dumbbells.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/mofutogiwebon.pdfIn PDF document text
    • http://tusajemepo.epizy.com/lego_boost_robot_manual.pdfIn PDF document text
    • http://kidaberotumopog.epizy.com/android_messages_dark_mode_missing.pdfIn PDF document text
    • http://padusij.onlinewebshop.net/istikhara_ki_dua_with_urdu_translation.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/74897557967.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/vexizajozaxufesanukekajel.pdfIn PDF document text
    • http://tiripetejakiwa.rf.gd/noxisovumizan.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/distal_dvt_chest_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/vsphere_client_portable.pdfIn PDF document text
    • http://sifebitufol.onlinewebshop.net/neurological_disorders_course_and_treatment.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_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 5564 bytes
SHA-256: 7022579481661d873356ff028878287a3fe094f68253cdff2886f35b3e001849
font_01_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 12408 bytes
SHA-256: 052f279637b6107bb87f866a564727ed4761c78071de1c4c1666d664dab88ad7

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