Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fca3a13d7137d1b…

MALICIOUS

PDF

74.4 KB Created: 2021-05-25 21:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 83f9fc0317b17b7eb0635769cc453437 SHA-1: 925840cbd7338a6b8c0941daa2a718259ee347da SHA-256: 3fca3a13d7137d1bb1e333a0240a0a63d107fc239692b1f19686de33e0ac0e3a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or SEO poisoning attempt. One primary external URI, https://xezojetit.ru/strik, is flagged as unknown reputation and is likely malicious. ClamAV detection and ML classification strongly indicate maliciousness, with the ClamAV signature pointing to a phishing trojan. The document body, though heavily obfuscated, contains references to 'measurement worksheets for kg' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent.

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://xezojetit.ru/strik?utm_term=measurement+worksheets+for+kg PDF link annotation
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/5d0a5a69159baf2.pdfIn PDF document text
    • https://kakoxisowi.weebly.com/uploads/1/3/4/3/134358665/50ec897d1de.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/9507056.pdfIn PDF document text
    • https://kikezisukoka.weebly.com/uploads/1/3/5/4/135400991/siwakojerozofez-ruporefotaze-vireral.pdfIn PDF document text
    • https://tetufimaburovi.weebly.com/uploads/1/3/4/0/134098130/6637383.pdfIn PDF document text
    • https://tazizepi.weebly.com/uploads/1/3/4/4/134439401/tozilowizavuxav.pdfIn PDF document text
    • https://mipurokuniveg.weebly.com/uploads/1/3/4/5/134508865/dinovax.pdfIn PDF document text
    • https://fepexugoroba.weebly.com/uploads/1/3/4/4/134469665/7825523.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/jubiferekaka/74656728561.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/vudikepewuwesipu.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/bamidojiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/kefojemizupiw.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/kamogatenelerotawijoko.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/firepro_aerosol_fire_suppression_system.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/bigomejilusumadufa.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/design_patterns_in_javascript_download.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/digital_marketing_strategy_template_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/19800353194.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/kugufi.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/11522817898.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/fufulax.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/minority_report_cast_list.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_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 5308 bytes
SHA-256: bdab56d890ceb0714590be0cc4269199a7dbe227b37bda4a5abf7d7fd2464eb9
font_01_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 10684 bytes
SHA-256: f0e2599c5f98abc4a40140949f7f6a2e67e6b87372209f5b61d073700b0345e6

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