Malicious PDF — malware analysis report

Static analysis result for SHA-256 54486d10931d7928…

MALICIOUS

PDF

72.5 KB Created: 2021-03-06 06:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aaaf63b0f6221b4552158ad4d791d519 SHA-1: 7ba6b3a7df976de1a0a9fbee15ec9e397d35229b SHA-256: 54486d10931d79283a63ad4710176d951e2ef85922f90b626c91dd404a5be813
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and appears to be junk data, suggesting the primary malicious function relies on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=crosley+radio+director+cd+recorder%252Fturntable In PDF document text
    • https://cdn.sqhk.co/xovinexesun/jhjiAoN/zenubabavatojuv.pdfIn PDF document text
    • http://wiinorama.fun/hatha_yoga_sequence_sadhgurue17yt.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/eidjccW/52616315902.pdfIn PDF document text
    • http://winoorama.site/16569510293sy0d7.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/F1W4ic7/sovesoweduka.pdfIn PDF document text
    • http://sk-anker.ru/best_arabic_music_audio38ma8.pdfIn PDF document text
    • http://dorightunion.com/arrondir_dans_une_formule_excellsmx1.pdfIn PDF document text
    • http://bestunew.xyz/rocket_dog_shoe_size_guidevig58.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/terufesix.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/sat_practice_test_10_essay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vapite/best_international_law_universities_in_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/welep.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_3f7358d68c1244158f92704b80833456.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a88130d-51e1-4531-b3bd-792d9d3adb5b/ap_physics_c_electricity_and_magnetism_textbook.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_56d28a9fd6124b0ba8d720b9101f7aa2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbeb49f1-faf6-4ec1-8343-bae2ae73013f/how_do_you_scan_multiple_pages_into_one_document_on_a_canon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d371764-1859-4332-89bf-20e82e463b7a/penimodexadetenobaf.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_91c8d311e5a94d6abac311554abfa7d5.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_0795f492f22d42838591eb7cf5fadded.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_de39ac8bb1534e258f813f6580b0230b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/lista_de_barbituricos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 5116 bytes
SHA-256: 3ec6f0d31ea476a546cf99da13368d823c126395e026e642ef5d2411cc4e2297
font_01_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 10732 bytes
SHA-256: 539c546818294a69c915032d7c37de441f3ed724350e6175ddc18c5d186b33cd
font_02_sfnt_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f