Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f716681047d6134…

MALICIOUS

PDF

84.1 KB Created: 2021-03-27 23:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e992029f1300ed96f0c6d47c5200900f SHA-1: b0834d6a0f30a6513b12cf42c62b4e398c74c2ac SHA-256: 4f716681047d6134a615d2b93d47eebf10199d388d2a4df1f26334351856477d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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=troy+bilt+riding+lawn+mower+value
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/vivoduxabaxotejeveg.pdf
    • https://boxijapemisavar.weebly.com/uploads/1/3/0/8/130874030/lagovexop-nubusopawigofa-kuxotoruwo-danupoka.pdf
    • http://dotavulilego.mypressonline.com/tidokimisutivawijosif.pdf
    • http://daritibule.iblogger.org/pinizonob.pdf
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/jujisave-losaretux.pdf
    • http://bafiselavanebep.mywebcommunity.org/us_army_recruiting_office_puerto_rico.pdf
    • http://fekevopimibun.sportsontheweb.net/birozugijofifopajiluvutuv.pdf
    • http://lebuvowune.getenjoyment.net/abciximab_davis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pevogikuxupeja.onlinewebshop.net/53424796401.pdf
    • http://kozogasivufi.myartsonline.com/64914163475.pdf
    • https://s3.amazonaws.com/muxegeza/makisurugataveve.pdf
    • https://s3.amazonaws.com/gurafoga/clases_de_ingles_gratis_en_el_bronx_new_york.pdf
    • https://s3.amazonaws.com/tufitijinexu/detox_diet_plan_weight_loss.pdf
    • http://zomufebike.epizy.com/94175655404.pdf
    • https://s3.amazonaws.com/wujixus/abbyy_lingvo_crack_android.pdf
    • https://s3.amazonaws.com/wejuvono/16659543571.pdf
    • http://numilovazafutet.rf.gd/71195856114.pdf
    • https://s3.amazonaws.com/gafedupeba/sotuxevapudatewivumikuref.pdf
    • http://niwurekatexo.atwebpages.com/amplificateur_oprationnel.pdf
    • https://s3.amazonaws.com/lorugipopuxe/19529929836.pdf
    • http://zejusamipokera.myartsonline.com/54878263532.pdf
    • http://roxujewov.myartsonline.com/lukoga.pdf
    • https://s3.amazonaws.com/lorerexeg/15539535555.pdf
    • https://s3.amazonaws.com/nazekisigiduz/belzona_1321_technical_data_sheet.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_off00010c08.bin
4958d47fc868afc774ac4efd5518a12767f96f82e79e393b25bd6c5de470e7a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 5312 bytes
font_01_sfnt_off00011e1f.bin
b09ccf3f43b4c3f8ff119222bc8dd3da5d071041fdbc46b48e51aa5c8ffe66c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 10868 bytes

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