Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f539938f6716a1…

MALICIOUS

PDF

75.2 KB Created: 2021-03-17 15:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c75587c23a9d86ce6185af148dfd607d SHA-1: b314e49999fdb8f0198bd9bd32796a393879de6f SHA-256: a3f539938f6716a1aa2d16d29c4b9cf01efa48b5494948be08ceffe8bd7a46e9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, suggests a template for office dividers, a common lure for phishing attacks. No scripts were extracted, but the presence of numerous external URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/123?utm_term=template+for+staples+8-+tab+insertable+dividers PDF link annotation
    • https://cdn.sqhk.co/kigaratak/hhihQMT/57022275870.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/ifsgf9X/20213312447.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/jugakoxibaj.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/jexibjd/full_movie_website_for_mobile.pdfIn PDF document text
    • https://rutikaxa.weebly.com/uploads/1/3/0/7/130738846/zevizuz_ganixerup_zolizir.pdfIn PDF document text
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/6880374.pdfIn PDF document text
    • https://cdn.sqhk.co/lofopapenow/Vk7Aijd/gabukix.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/gawikinezupiv.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/xgg2ieH/tiny_house_builders_tampa_florida.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/fuwenoxuzasila/how_to_reset_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/burnout_paradise_remastered_igg.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/pofisegumokokegu.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/whirlpool_cabrio_dryer_manual_wed7300xw0.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/zupiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/57554396847.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/catanzaro_informa_incidente_botricello.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/86411883905.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/66024721680.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/xifejomonogifemiguxapalur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7cbf88b-d2a2-4bc0-8bed-7db5796ef29b/43313807608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0183e5-59d1-4fc5-ae67-368dcf68e181/chemistry_zumdahl_9th_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/cleveland_browns_injury_report_week_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6267a57d-8ab2-4476-b293-afaedb4815c0/what_is_the_focus_of_vygotskys_theory_of_cognitive_development.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_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 5564 bytes
SHA-256: 2fb47c489332006e1ebfcb76c435f66a7ffd2f54d25fe3048dab694750f0e640
font_01_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 11300 bytes
SHA-256: 015d32f10e6b1214097a6aa4fb1233fcea612db82794c6e3a4ef289bcbcaa75d

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