Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a619f891d271da5…

MALICIOUS

PDF

80.4 KB Created: 2021-05-21 14:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8fd4bd6c38b712ff46f14da991e06613 SHA-1: 14dfb784d388f2821f73dd6c58122193f6933e49 SHA-256: 9a619f891d271da52094510c542496c94fa14ad04e7246a8a7cd13ea50e7ddc1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URIs, 'https://fokemale.ru/strik?utm_term=11+standard+admission+form', is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://fokemale.ru/strik?utm_term=11+standard+admission+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369772/normal_5ffe737d02015.pdfIn PDF document text
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/pudovir-wesiw-tifulelododope-nanoxapirudax.pdfIn PDF document text
    • https://terabuzaxora.weebly.com/uploads/1/3/0/8/130814115/pidige.pdfIn PDF document text
    • https://bametijabazi.weebly.com/uploads/1/3/4/0/134041776/9457314.pdfIn PDF document text
    • https://kigusokitog.weebly.com/uploads/1/3/5/3/135300221/8200358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_6057f917280fa.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/69b379d5-97dc-4a81-ac04-a5d9a777464f/90093398870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ac20f0-4d96-46c8-a8d0-0cf2f6b7bb6e/14833757206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaae1bae-f9ab-4cc7-810f-89da86d2a6fd/role_of_teacher_in_organizing_co_curricular_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7dedef-95ff-458e-b4f9-0f8e46e32e59/momemuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3067d32-4fef-4abe-9729-587ea6491b90/zufigawiwakepovokare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f70d31-ab33-4daa-9718-53d9ea0da435/dell_latitude_e7450_review_cnet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4822adc-bf77-480d-9d02-e414c3f3b267/24652074964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2262a1fe-3c1f-40b8-84d6-c4b8f0bed1b6/pigifewota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efacb689-d1a6-4c94-b867-3bcd47ea1d12/tanaduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ca4885-90f8-4af8-ad42-0c3447d983ef/new_home_treadle_sewing_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeced707-0bd5-4ec6-812f-2a4f152dd794/how_to_clean_a_gas_pilot_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363888ba-46bc-4175-aa86-0b96172adad0/arbonne_hostess_rewards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bec4d05-4f22-42bd-9a9d-35fc2b3927a3/pemodanuvuwisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe32a9ac-eab4-4de4-a608-fd4bc5e22505/rheem_power_vent_water_heater_fault_codes.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_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 4980 bytes
SHA-256: 0a3b2d645db437c435a47e6bed8ea45b5e0b7be466535ca912b99fbe02c554ba
font_01_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 11160 bytes
SHA-256: d593a87c2125ea9a0f61ade451ba9503cd46e9f811cb2cea76922bd0df7f12fc

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