Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1453663c2ce84aa…

MALICIOUS

PDF

77.5 KB Created: 2021-04-19 10:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1613b94a8de3e140823806b12d733a8a SHA-1: 5645b51a5547b678a36858232c9d93d4addd49e5 SHA-256: d1453663c2ce84aa5eacf12f7871bd25013077108bf57001d04cfb7c98be2568
216 Risk Score

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. It uses brand-impersonation credential phishing. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gawenowufiwozup.weebly.com/uploads/1/3/1/3/131383543/wigukujujonetowu.pdf.
  • 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://dafemum.ru/strik?utm_term=that+time+i+got+reincarnated+as+a+slime+light+novel+volume+5+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469119/normal_6050b35a285be.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimurami/wnVhfl9/skyrim_dragonscale_boots_id.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_6063892af0d77.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/mfUOBia/magiwafudidabafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_600f2ddb8e509.pdfIn PDF document text
    • https://cdn.sqhk.co/jaguwubax/iK2HgfV/jelly_shift_best_games.pdfIn PDF document text
    • http://soul-felt.com/what_do_the_lights_on_a_trickle_charger_mean3oxrk.pdfIn PDF document text
    • https://gawenowufiwozup.weebly.com/uploads/1/3/1/3/131383543/wigukujujonetowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_606ca7e233730.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/mekuxnujed.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/5rfgehi/84851711435.pdfIn PDF document text
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/jadudasebonalej_pijita_zutatenuwidiw_jemusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f34ecff-3612-4611-a42a-091d847ae1c3/what_is_a_wake_when_someone_dies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5237bc1-6055-4906-bab6-0fc8f0be7e64/teaching_english_as_a_second_language_online_no_degree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11b1f93-38bb-429f-94ce-073c07ae0d74/41747287952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb403a6-3608-4a6a-b089-32bb96ad610b/23847512859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739b58e5-f5a2-4a0d-9628-24cba757b011/40607069563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e4f5ad-bff3-4863-8216-214e7b24c446/who_owns_raynor_garage_doors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a80ae0-5824-4b9e-903a-c1f7f228eff6/how_to_hard_reset_plantronics_voyager_legend_bluetooth_headset.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_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 5484 bytes
SHA-256: 9942526a51e6952a2c642b80628652eb7828759029c1c63438371919ba0644a0
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 10808 bytes
SHA-256: 3bc8dce940f8a413c9a3b3c97197dd4ba5c0086bbc0b0bbd0d6a1336ab0637e2