Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52ffca31cf34591…

MALICIOUS

PDF

123.9 KB Created: 2021-05-22 13:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 96022df842c23b7d8ba46a5988c4a214 SHA-1: 31cef39d62818e339d00ea9066407976548d2afa SHA-256: b52ffca31cf34591cbfa1dba63190c083891145bf914bd79469dbcf22b69edf9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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 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.
  • 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://midufefew.ru/strik?utm_term=how+do+you+lose+weight+with+herbalife+shakes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489245/normal_606e7fad6b226.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/vapakim_laretimuzenuzux_filugexanasoban.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_6064330eecd90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502511/normal_601b266539ad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_600aec590b2db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_604cbe0bdb4aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489740/normal_601920e41a3f5.pdfIn PDF document text
    • https://bakasilamor.weebly.com/uploads/1/3/1/4/131407315/kuriluwufu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitatotol/birthday_cake_and_flowers_images.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/mediterranean_diet_plan_for_weight_loss_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/can_a_humidifier_work_without_a_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/are_all_diabetic_test_strips_the_same.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/41570872053.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/getafobitunimagonu.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/ejercicios_resueltos_de_porcentaje_para_quinto_primaria.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/papudumudemijavafanom.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/90389898716.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/sherlock_holmes_books_price_in_sri_lanka.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/juxafisarizovivapuninupa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000191de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191DE 5528 bytes
SHA-256: 11666929370b34dd7612b9daf1f1fcb9a27546e68572e723dfa86326758d7bc2
font_01_sfnt_off0001a4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4BC 11608 bytes
SHA-256: 432c5bf12beb913d04dd194c868ded076c4ad1d39a29c2d1a87f5c147fd998fe
font_02_sfnt_off0001cc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC7F 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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