Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23299520cce2a87…

MALICIOUS

PDF

78.4 KB Created: 2021-04-02 03:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 00f1007a4242ff7e4d548563cff8a56f SHA-1: ad27d62f112a3a3cfaf9260aba5fe7b8b4033a02 SHA-256: e23299520cce2a874411fe3894ae3da9a41744b2f4898ee8e9df6c686f6b1b63
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 of which are to PDF files, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/aws?utm_term=maximum+normal+stress+theory+for+ductile+materials PDF link annotation
    • http://reduslimitalia.website/marketing_plan_template_free_powerpoint24o7r.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/8018186.pdfIn PDF document text
    • http://vifuwala.iblogger.org/35527871770.pdfIn PDF document text
    • http://crystal-light33.ru/casio_digital_camera_battery_charger5m7l6.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/51482550373.pdfIn PDF document text
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/jigoru.pdfIn PDF document text
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/9832454.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/xovojuxopuwopejovumeme.pdfIn PDF document text
    • http://ovca.space/fun_home_graphic_novelfskq4.pdfIn PDF document text
    • https://moxidoneke.weebly.com/uploads/1/3/5/9/135993461/9753737.pdfIn PDF document text
    • http://study-english-05.site/alarm_clock_sound_onlinevec5q.pdfIn PDF document text
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/8978691.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/kiremefegonar/xarudijog.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/awdhesh_premi_video_song_bhojpuri.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/29692449998.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/fipojagamejama.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/vifitadapevazevapor.pdfIn PDF document text
    • http://numapezo.rf.gd/what_are_common_safety_hazards_in_the_workplace.pdfIn PDF document text
    • http://jadefixadejin.rf.gd/1699107502.pdfIn PDF document text
    • http://banolepepo.epizy.com/99485806958.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/traffic_accident_report_austin_tx.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/fibazas.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_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 5436 bytes
SHA-256: bf7533d09e8afe7b76694d630e97d1e38c0f02cdfe39e0d33d10891b0783d81a
font_01_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 11856 bytes
SHA-256: 69f226ef21d3ed0f3ff6a3857b61555a748f71d9ceebbe554b479a437b48257b

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