Malicious PDF — malware analysis report

Static analysis result for SHA-256 4045261ab7440329…

MALICIOUS

PDF

136.3 KB Created: 2021-05-16 00:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a4c28e65043cd9e739cef81f45e935bf SHA-1: 28486d1da7d410929150e0bf2d5bc87a1e735551 SHA-256: 4045261ab74403290f84745c096401cb28c818570fe52d01da8cc8aebb31ce3b
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, likely as part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/strik?utm_term=who+is+the+richest+asian+american PDF link annotation
    • http://govnosiakxws.online/71850908043bam2p.pdfIn PDF document text
    • http://apkweb.net/3980877581c7v7m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_604b7a059fae7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462688/normal_600370f22fb7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_606dcea84f069.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/7497f54d-f2d1-4673-9bc1-88784a3d21ef/wuxapisapesogamin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f833a619-cb9e-49cc-b41c-d04752b055a8/ronusuvorosagagek.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/breathing_exercise_for_asthma.pdfIn PDF document text
    • http://lokutoge.rf.gd/anthima_parata_amathanna_audio_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/pewadimukisolapipizikes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e3878c6-f8b7-4230-9424-90a431ea3c64/how_to_use_my_camera_as_webcam.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/11400997159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b833a97-50fd-4d0f-9e17-26c7d719639d/el_nombre_de_dios_en_todos_los_idiomas.pdfIn PDF document text
    • http://pujusojup.epizy.com/dasam.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/sahih_al_bukhari.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/70192996419.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/whitfield_pellet_stove_parts_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73238d9e-1033-40c1-90ae-a076e9d0ed07/c_all-in-one_for_dummies_free.pdfIn PDF document text
    • http://roragopijejem.epizy.com/tigudijulibikisesizuxigis.pdfIn PDF document text
    • https://medlineplus.gov/asianamericanhealth.htmlIn 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_off0001da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA61 5020 bytes
SHA-256: b0e36d56acd635cf240876e206eeb876e165a2870cc275d1109f3c75079b4450
font_01_sfnt_off0001eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB56 11796 bytes
SHA-256: a1ac2d4b0e97c21b73a905839b74dbb554575fadb8e0a7e0751224aa30f42d8d

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