Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcfc9ef2f2326c0…

MALICIOUS

PDF

115.7 KB Created: 2021-03-13 16:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49b9b912b66d86e05a54fcac719d5377 SHA-1: 0fe55ccdc86bdcd05c582c05755d6d8b2017e30f SHA-256: dfcfc9ef2f2326c09ab70e69801b9bb3f961841e0634f6fe5d8b908d38733a18
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 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://fokemale.ru/aws?utm_term=is+a+series+of+unfortunate+events+a+netflix+original
    • https://vejevidumuruje.weebly.com/uploads/1/3/5/3/135302175/benawiluzogel.pdf
    • http://juzezudusota.mypressonline.com/what_are_3_negative_character_traits_does_odysseus.pdf
    • https://fijuvosezo.weebly.com/uploads/1/3/4/0/134096395/9306200.pdf
    • http://wabaxifejem.sportsontheweb.net/sawoduvoxiziwexekewur.pdf
    • https://static.s123-cdn-static.com/uploads/4463010/normal_60084c4ea61d6.pdf
    • https://static.s123-cdn-static.com/uploads/4476150/normal_60047d6b01fcb.pdf
    • http://natur-bio.space/raymond_carver_late_fragment_meaningqqfs3.pdf
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/70308ad9844d.pdf
    • http://euroshopmn.space/conjunto_por_comprensinzj0fy.pdf
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/jepofewonif_tixofexapowoto_boxiz.pdf
    • http://dabedera.mygamesonline.org/al_quran_bangla_translation_word_by_word.pdf
    • http://reactivaperu-2020.com/zitebir3gjl3.pdf
    • http://klossheff.xyz/games_android_2018_apk4sid9.pdf
    • https://cdn.sqhk.co/goluxewimabu/Fiahejf/chickens_not_laying_eggs_in_winter.pdf
    • http://vadosixajobirug.mygamesonline.org/toyota_camry_2020_price_in_canada.pdf
    • https://jubiporosevuzu.weebly.com/uploads/1/3/2/6/132695682/2823836.pdf
    • https://cdn-cms.f-static.net/uploads/4421943/normal_600aad018586e.pdf
    • https://cdn.sqhk.co/xafiguzi/QKhchda/daburasa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_37b31707c2f8408880b59130abc97501.pdf?index=true
    • https://970c1b50-6489-4e49-adce-330d1cddb9b3.filesusr.com/ugd/6166c9_e147966f973f48f59c167dd61a57103d.pdf?index=true
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_5fe93e5d8f644a029c6f2c341a873057.pdf?index=true
    • http://kigokigaruv.myartsonline.com/netgear_n150_wireless_router_wnr1000_v3.pdf
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_b1677ef310494e3cb5c5489c33e7c4af.pdf?index=true
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_e8aaae1af49447668aac50c40fac8800.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018864.bin
b088e192b2511cd01818679f6d3ffb44c72455921d398947c45f3d40e755fa5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18864 5000 bytes
font_01_sfnt_off00019985.bin
ea0c0f4df5d8f4369d52ceab2f8eaa66b5feb1b1bea6d788fd51fb80c7144907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19985 11888 bytes

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