Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31cfb6a43ac8128…

MALICIOUS

PDF

75.4 KB Created: 2021-03-04 14:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3feeb5a02d01de65529fb0be49a0a9ae SHA-1: 9874eb14a2b04f13381dc2f5a9217e019494fc54 SHA-256: b31cfb6a43ac8128ac8bf42a3071324a3fa4b71d6198808ebcbf836b191268b7
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains keywords related to 'praise and worship christian songs with lyrics' and 'wkhtmltopdf', which are likely used as a lure to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://jumiwimov.ru/strik?utm_term=praise+and+worship+christian+songs+with+lyrics PDF link annotation
    • https://jevogivufete.weebly.com/uploads/1/3/0/7/130738845/juzivuwawaj-xopixetanafa-boboze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392237/normal_5ffa710389a28.pdfIn PDF document text
    • https://kerixagagunusuz.weebly.com/uploads/1/3/0/7/130776265/652487.pdfIn PDF document text
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/zafoxefip.pdfIn PDF document text
    • https://kuxivudu.weebly.com/uploads/1/3/0/8/130813582/pagigo_woxunibukapuvu.pdfIn PDF document text
    • https://woziwunamewig.weebly.com/uploads/1/3/1/6/131606321/galuzo_dozolimaviwabu_lefuw.pdfIn PDF document text
    • http://sanamikegimelab.22web.org/the_hobbit_2_movie_download_in_hindi_dubbed_480p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420025/normal_5fcc41281910a.pdfIn PDF document text
    • https://dutizadip.weebly.com/uploads/1/3/4/8/134889078/9792582.pdfIn PDF document text
    • https://roviselazadavuw.weebly.com/uploads/1/3/4/0/134040559/5e3108d789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425760/normal_600a05c02bf74.pdfIn PDF document text
    • https://ropifupagefe.weebly.com/uploads/1/3/4/5/134584424/punagazivupobonaxim.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/vudolimo.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/delta_scroll_saw_blades_40-540.pdfIn PDF document text
    • https://gulezawajure.weebly.com/uploads/1/3/1/8/131858287/dd16f4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_5fd710b6be477.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/49388514290.pdfIn PDF document text
    • http://duvejiwuxikon.getenjoyment.net/xaromedigejelezizi.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/cinderella_disney_book_1950.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/1b08c7fb-9f2a-4e51-ae99-138e68a774d5/51103909414.pdfIn PDF document text
    • http://dumizalu.epizy.com/rebajo.pdfIn PDF document text
    • http://jogukazulani.epizy.com/zejufufexezodibinefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba94533-6c03-4f09-8047-91a7805214e8/ganoferemetobanubebevanar.pdfIn PDF document text
    • http://fozubada.rf.gd/uncle_ato_audio_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d16013-9ac6-470a-85e2-e16100109f69/watch_the_original_pippi_longstocking_movie.pdfIn PDF document text
    • http://tonesovuxor.rf.gd/ramigumo.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_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 5528 bytes
SHA-256: af389a1f36df407608a7d91dfc3bc27b16305ff1489cbe2743bc42725e6ab8fa
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 10884 bytes
SHA-256: e2571f7d6f8de5e9815e8fc69ea1962134bcb89163a7556e4d28912061ed09b9

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