Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d334caeb7cc3e2…

MALICIOUS

PDF

76.5 KB Created: 2021-03-21 11:09:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c93d598f31d1622d915e2cd2e75ae2a SHA-1: 2954e34a75a3f9dfe2f3fe12e43da741d4314cad SHA-256: 14d334caeb7cc3e25fc297a792ed2433eeae63199f6d7895ab97a3fcb5ad7af3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites and PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link-farming scheme to manipulate search engine results or distribute further malware. No scripts were extracted, but the presence of many external URLs suggests a redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=barriers+of+effective+communication+pdf
    • https://wapofowivukixog.weebly.com/uploads/1/3/4/0/134017250/8e7ba05a76213.pdf
    • http://tazuwaxibasozi.22web.org/52277655098.pdf
    • http://budofibo.mygamesonline.org/dell_optiplex_gx280_drivers_windows_vista.pdf
    • https://viwitilabepimep.weebly.com/uploads/1/3/2/6/132695477/2665334.pdf
    • https://cdn-cms.f-static.net/uploads/4405194/normal_6017976d182e9.pdf
    • https://jerolota.weebly.com/uploads/1/3/4/8/134859034/linafotiloziwev.pdf
    • https://vebusigatibata.weebly.com/uploads/1/3/4/3/134321359/2286973.pdf
    • http://barajofa.mywebcommunity.org/how_to_integrate_software.pdf
    • https://zeruxukekojumu.weebly.com/uploads/1/3/5/3/135345771/055a8.pdf
    • https://cdn-cms.f-static.net/uploads/4446642/normal_6044217769a86.pdf
    • https://ragesetenavuxom.weebly.com/uploads/1/3/1/6/131606186/a6f08f12bf5.pdf
    • https://jifujutikawe.weebly.com/uploads/1/3/5/3/135328504/jipeba.pdf
    • https://cdn-cms.f-static.net/uploads/4418013/normal_603c87299266b.pdf
    • https://cdn-cms.f-static.net/uploads/4460725/normal_60146a63c6d14.pdf
    • http://lagopuxu.iblogger.org/how_do_i_get_my_wireless_brother_printer_to_scan_to_my_computer.pdf
    • https://cdn-cms.f-static.net/uploads/4476268/normal_5fd95b85e5b43.pdf
    • https://lipanoragufa.weebly.com/uploads/1/3/4/4/134489679/9072408.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulolimepol/94135885366.pdf
    • https://s3.amazonaws.com/litunux/86154632591.pdf
    • http://vefovax.rf.gd/troy_bilt_bronco_tiller_manual.pdf
    • http://fiwarirekagugen.epizy.com/55472549942.pdf
    • https://s3.amazonaws.com/rozebofukixus/82391681644.pdf
    • https://s3.amazonaws.com/lonozote/craftsman_3_gal._oil-lubricated_air_compressor_with_accessory_kit.pdf
    • https://s3.amazonaws.com/kisimujuk/pulozisotivenelagutuw.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_off0000f0c3.bin
003d2d94aa6d8d489af99564d4302d5b17fe62cb14e05cdd14190a7fffd217d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 5376 bytes
font_01_sfnt_off00010301.bin
66d68b6b17949d56b932175592d15cff35063af211903554211086f10ec44378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 9740 bytes

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