Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84427ade898a61a…

MALICIOUS

PDF

108.1 KB Created: 2021-03-09 10:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cecd7ddd7f5a28e91d513e341bf62b6a SHA-1: 22778cb2c5b1f830f42ceb39069a455ef2078c45 SHA-256: d84427ade898a61a7a4c5321466c3a2bafea3d7cfa0798645580fcceb576310a
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, two of which are identified as potential link farms on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and the ML classification strongly indicate malicious intent, likely related to spearphishing.

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://jumiwimov.ru/123?utm_term=barthes+semiotics+pdf PDF link annotation
    • http://digtalcaliper09.xyz/sawusatidijexawdj9k.pdfIn PDF document text
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/4025453.pdfIn PDF document text
    • http://thecet.xyz/soundbot_sb571_portable_wireless_bluetooth_speakercy7x1.pdfIn PDF document text
    • https://cdn.sqhk.co/gekakisoduvo/7aa8sgg/certified_occupational_therapy_assistant_jobs_near_me.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/moto_g_power_2020_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/hcrgd2t/26233765415.pdfIn PDF document text
    • https://tidijesugeji.weebly.com/uploads/1/3/4/7/134764535/6990018.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/phone_says_line_in_use_centurylink.pdfIn PDF document text
    • https://cdn.sqhk.co/nivatasob/VVN7gfX/94106961426.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/seborel.pdfIn PDF document text
    • http://maewallace.com/tulja_bhavani_naa_songs1t21k.pdfIn PDF document text
    • https://mosezusimoz.weebly.com/uploads/1/3/1/6/131637881/6445584.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/ddb3560fcb118.pdfIn PDF document text
    • https://cdn.sqhk.co/dulidara/Ahdc43G/download_survivalcraft_apkpure.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/38435ddc-87c4-4e43-b7fa-e7d203cd4bd5/manifiesto_comunista_descarga_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abeab3de-b6ae-452c-b0b8-93182529d25c/como_se_hace_la_fotografa_documental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70add2e9-a247-4380-b6e0-b2e4953c1b14/guzanejaxedetorun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33984828-13ea-4dea-8ada-7c15f9926693/escort_passport_9500ix_vs_max_360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ded0cad-3ec6-401c-879b-14096c4d7a7d/98942060740.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_off00016729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16729 5412 bytes
SHA-256: 4c1f069c2debc9f511bc116e8a81fb1fbe59423f8f508d3929e4c2abf4209df8
font_01_sfnt_off00017964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17964 12764 bytes
SHA-256: 7d05f463c9a440fb6268116850367f2b856100313818f40abdbc5494fcf5f610

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