Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8425f565ca2befa…

MALICIOUS

PDF

107.6 KB Created: 2021-04-30 09:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c4bb47d03da835d9c529c1d76df21ebd SHA-1: b05fa104ee2584fdfebf49c47f65890b6aec7bd6 SHA-256: a8425f565ca2befa22ff7a5bde8d8f735d0b0e69ac830f5c8c36536aa7a673a7
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://leonvi.ru/strik?utm_term=why+won%2527t+my+hunter+fan+remote+work PDF link annotation
    • http://fringigejy.site/vigidisodepevegf9815.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/how_long_is_paid_family_leave_in_california_for_fathers7egl7.pdfIn PDF document text
    • http://rm-swis-mine.com/descargar_musica_de_toque_de_banderawfhd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_6ad52a5a8add478ab68ef5365d3bbee0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/zakozer.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/alamofire_image_swift.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/meade_autostar_software_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc82f3aa-a1a9-4cf6-a122-6b5b494164ef/the_mortal_instruments_city_of_ashes_movie_2018_trailer.pdfIn PDF document text
    • http://gidepajujida.rf.gd/32139574956.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/qmp_board_2020.pdfIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_d585e912b8464cc9afb56a9d7bd1d3c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f21ae7-9ae6-470e-9538-dc85dfbfaa8d/zifedaxiwabegolamumune.pdfIn PDF document text
    • http://lejopuluke.rf.gd/31831203763.pdfIn PDF document text
    • http://gosasunodununu.rf.gd/42519527306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef275f04-949a-480c-97c8-645a0e3f6ac1/92038815109.pdfIn PDF document text
    • http://jesowafifu.rf.gd/kirebuledajazipudino.pdfIn PDF document text
    • http://lexawelezalum.epizy.com/83509216277.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/amazon_fire_stick_apps_wont.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b285fa77-c2b6-4603-bf75-3182203799ba/10516074600.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_off00016493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16493 5100 bytes
SHA-256: a1379d07016c82cce24bb615b120de8b8668757c992eeb04b0ece805a6bcbfbd
font_01_sfnt_off000175e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175E9 12980 bytes
SHA-256: 3dd4cd4c7a531194346db843c13e4b63d48db991c1b82de5d946ec00d577bd87

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