Malicious PDF — malware analysis report

Static analysis result for SHA-256 30053e5849128e33…

MALICIOUS

PDF

69.9 KB Created: 2021-02-21 18:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7c939cbfa77d4526e4c2ff95a966e5ee SHA-1: 430175603c6630c57944f3d403ef16194e845550 SHA-256: 30053e5849128e330a0e156362ba93afa132d63135c8eb903b19b280443c6208
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a link farm, with numerous external URLs embedded within the document. One prominent URL, 'https://seumenha.ru/strik?utm_term=how+to+freeze+frame+premiere', suggests a lure related to video editing software. The presence of a ML classifier flagging the PDF as malicious and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+freeze+frame+premiere PDF link annotation
    • https://cdn.sqhk.co/niserutom/jiMjbhi/33217546419.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/Nihbigd/dying_light_zombie_invasion_with_friends.pdfIn PDF document text
    • http://good-production9.site/gospel_of_the_holy_12zhsvb.pdfIn PDF document text
    • http://goshop32.site/vupimaremuj3fclc.pdfIn PDF document text
    • https://boxizegovabore.weebly.com/uploads/1/3/1/3/131379280/wimimokubojoke_veribuba_tojotoluwufo.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/gjjgCCC/14732594679.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/pujirageg/adolf_hitler_biography_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/phenytoin_davis_drug_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/lagu_surat_an_naba_ayat_1-_40.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/vipodufagoteseroxirat.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/dadiraxisu.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/fanuxineluk.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/astro_vision_lifesign_horoscope_app.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/42799837678.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/valentines_high_school_ilford_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/gladius_relics_of_war_astra_militarum_guide.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_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 4940 bytes
SHA-256: 4988a070a19441e093b89247d3b7e8cfe95215cdddc7a0c0aaa805f0c6ca9263
font_01_sfnt_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 9940 bytes
SHA-256: 0a936076e83e89db92fe13c01b55ce7deb93ccaa25f550c4e127360a1f422409

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