Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cbc1b9095128ea…

MALICIOUS

PDF

115.1 KB Created: 2021-03-24 11:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 943aa18153345e483ab43e87a57b39b1 SHA-1: 86e2c7e297245f41a6ddd347ef501e1a0b43c98d SHA-256: c8cbc1b9095128eae32d5e970cfd2db71a85d96c0ed343d6d17f5c6a79375b26
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://vilenefex.ru/strik?utm_term=pokemon+heartgold+guide+book PDF link annotation
    • http://rezotu.xyz/dipadini11.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/lugiwop20lj.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/tibinarodomexusopirilapix.pdfIn PDF document text
    • http://xbet1.fun/dell_r710_firmware_update_isonll6w.pdfIn PDF document text
    • http://ranking-se.com/wovawav83ip0.pdfIn PDF document text
    • http://mewudaguzexo.sportsontheweb.net/antologia_de_cuentos_colombianos.pdfIn PDF document text
    • http://istlan.fun/888307961694popj.pdfIn PDF document text
    • http://mailedflkf.site/communism_spreads_in_east_asia7xlqg.pdfIn PDF document text
    • http://powerpoint4you.ru/hp_laserjet_p1006_toner_walmartebzms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daxemo/spherical_bessel_function_fourier_transform.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/associate_of_science_csn_degree_sheet.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_bc3e7ae1e8f7480fb0b2b75c8e9750eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/kiwelusuw.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/rixizopejizasuxe.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_74b3e7c65cb546ffbf1c241f6420d372.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buwosevax/zoxazekakapokedidexa.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/dunkin_donuts_oreo_hot_chocolate_ingredients.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/2001_dt466e_oil_capacity.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_f22e23f88e4c4ad9b3744a79e36e9328.pdf?index=trueIn PDF document text
    • http://gakilasefit.myartsonline.com/gojitafitimu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 41904 bytes
SHA-256: aa4a57992cea364a4e12280c80078dd5b0fff185b3f20f1e17631be782dcb413
font_01_sfnt_off00016ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EBB 5264 bytes
SHA-256: 3722c201404fa48b72973a111a10a9c73f63e812f237bea4e28e9f016d26280c
font_02_sfnt_off00018076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18076 11676 bytes
SHA-256: 00b5f4961fbae46bd0f894205d92f3dd03e78e208359af738ff44560a13fda86
font_03_sfnt_off0001a7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7AE 16192 bytes
SHA-256: 9c7926b8929b88a1dffb52ec04bcfb477868fd459509337312ce674bafabbb6a

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