Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15bceca34cdabf3…

MALICIOUS

PDF

89.6 KB Created: 2021-03-22 08:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd57e48bf436d45b6b95a6553d83b817 SHA-1: 3286bd2cc8effb016a8ef9602d73511d5143990d SHA-256: d15bceca34cdabf34f8e42a18a147e164b63be7c58307032e6e8bb155840e357
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of a large number of external links, including a PDF link farm, suggests an attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=rosario+dela+preciosisima+sangre+de+cristo+youtube
    • https://cdn.sqhk.co/pugepavofu/jeHe5ia/microsoft_authenticator_android_requirements.pdf
    • https://cdn.sqhk.co/tirinakiweda/ifjijfL/rarisipugorijonevumel.pdf
    • https://cdn.sqhk.co/roweziwamu/UFii1ha/77436777133.pdf
    • https://cdn.sqhk.co/nowavutu/iji0iiN/96504371261.pdf
    • https://cdn.sqhk.co/wisulekekij/a5iaihB/pigegukipedimoj.pdf
    • https://cdn.sqhk.co/xemugugafot/FFbCvij/electricity_bill_calculator_bd.pdf
    • https://cdn.sqhk.co/wepunajexiju/hdIhif1/my_virtual_pet_shop_mod_money_apk.pdf
    • http://vevapefin.sportsontheweb.net/73441381556.pdf
    • https://cdn.sqhk.co/pijajawopoji/exl0cij/pobug.pdf
    • https://cdn.sqhk.co/tefazaturar/2M1Bpjg/kizinefalomatutudawefepit.pdf
    • https://cdn.sqhk.co/bujasugawo/8fieBvt/sniper_elite_zombie_army_4_dead_war.pdf
    • http://tejowigasinafu.getenjoyment.net/6460390864.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://biwefejiza.myartsonline.com/50743682527.pdf
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_cd6b2d5e4be3453c84bac62bf87152f9.pdf?index=true
    • https://s3.amazonaws.com/gulapore/usb_boot_stick_dos.pdf
    • http://peledopa.myartsonline.com/sikififegidot.pdf
    • https://s3.amazonaws.com/sugosubexez/87085238197.pdf
    • https://s3.amazonaws.com/juzowilipi/bigexurutoreze.pdf
    • https://8c330184-3457-40de-b162-e34763a77ed1.filesusr.com/ugd/0aae61_23e45594c0eb4adc95490f29f57fac27.pdf?index=true
    • https://s3.amazonaws.com/voxipanovigepiv/android_sqlite_app_data.pdf
    • https://s3.amazonaws.com/zamuriza/zibotarudilufupinaxidodoz.pdf
    • https://s3.amazonaws.com/gedimuta/dapabubelulumibega.pdf
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_f16fb2942681458b98788710e7a1c2e6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dd1.bin
2316f1f389b5c88aa749f1bdaeea769e01d7586ebd9c762a90891e88ddbbc76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 5640 bytes
font_01_sfnt_off000130f1.bin
88ac1b2a30e1703e61687dd44ffee200d9f8e0c49c4b07417bb9349d56f99b0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 11880 bytes

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