Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f804294964f0db3…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 13:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6692011581efc9085a03b436a99f4cfa SHA-1: 2c0c6fdfb090b8e08700361ee0ed62507e5be596 SHA-256: 5f804294964f0db38fbf8dcd375634292a2ee04dbca3ec51f9436250d7a5d99d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a fraudulent support number. ClamAV detection and ML classification confirm the malicious nature, likely involving exploitation or phishing.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pelibifir.ru/wix?keyword=civil+war+review+worksheet+answers
    • http://kevifiregerufug.scienceontheweb.net/lonely_planet_morocco_free.pdf
    • https://xegiduburap.weebly.com/uploads/1/3/5/2/135294675/kamibabozubad.pdf
    • http://gaydating.world/87569231322hsmbz.pdf
    • https://luwagibefex.weebly.com/uploads/1/3/5/9/135966535/gijitobox_zefak_xegomadu.pdf
    • http://help-copyrightservice.xyz/jexajilofapotagubizaa5hu.pdf
    • http://rubeatyshop.xyz/free_blog_templates_for_teachersf49np.pdf
    • http://rejemezurufoveg.mywebcommunity.org/what_time_does_the_stock_market_open_my_time.pdf
    • http://xuritepizib.mygamesonline.org/atripla_efectos_secundarios.pdf
    • https://cdn.sqhk.co/wazikunal/SbijIvs/kitolopekejisedo.pdf
    • http://reduslim-sito.site/what_does_bulk_temperature_meana13qj.pdf
    • https://cdn.sqhk.co/desiruzag/c6heHAK/kawaii_anime_girl_purple_hair.pdf
    • https://waferipesor.weebly.com/uploads/1/3/5/3/135307907/4757091.pdf
    • https://bopenuxot.weebly.com/uploads/1/3/4/6/134667357/892bb8cc26d.pdf
    • http://jevafurevozu.mygamesonline.org/volujez.pdf
    • https://sagojuxejuzogug.weebly.com/uploads/1/3/4/5/134598596/vazitubewolala.pdf
    • http://gimatadokij.mygamesonline.org/astrology_101_book.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wupixufekijax/acquainted_the_weeknd_audiomack.pdf
    • https://d787a32c-196b-4e99-9c98-3ae3c28023f9.filesusr.com/ugd/05b469_43862c32851646dc9e0dfddf8027b559.pdf?index=true
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_9181f440d24644c1adabfe176726fa7c.pdf?index=true
    • https://s3.amazonaws.com/vobuturinivi/msi_970_gaming_motherboard_cpu_compatibility.pdf
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_5ce2346d42a64755878fc399f8c6f8fe.pdf?index=true
    • https://s3.amazonaws.com/pasawe/dual_boot_windows_dan_android_x86.pdf
    • https://s3.amazonaws.com/voropa/steam_link_app_ios_beta.pdf
    • 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_off0000f58d.bin
717bec930af68f11c6d267ead342302559ecdf28653db04a9878cb379a838e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 4892 bytes
font_01_sfnt_off00010639.bin
3f4e35e6c7110d29412359bc195db4a20f15047903ac1dad50aef3c91d61851f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 10984 bytes

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