Malicious PDF — malware analysis report

Static analysis result for SHA-256 971893880745d201…

MALICIOUS

PDF

80.0 KB Created: 2021-06-03 02:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2f60fa5ec9a5763a6f66eb4ff764f5bb SHA-1: 51a38615ccf580cc6660d1374140334033e76823 SHA-256: 971893880745d201718e7e9aced5d0ec20dc2370a6191aa4ad322d3a4d652242
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to link farms, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a link farm or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/pbw?utm_term=50th+wedding+anniversary+pics+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fe3a1b5a3b83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_6049c4a04248b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421770/normal_5fe3db51dc07e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482638/normal_5fcba3f9b62d8.pdfIn PDF document text
    • https://joxujodeli.weebly.com/uploads/1/3/5/4/135400218/dobeta-naxevu-kixubenupowuk.pdfIn PDF document text
    • https://fupizabo.weebly.com/uploads/1/3/7/5/137509332/doleb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_6009f69141de3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_604d80fe921b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365649/normal_5fcd500109db6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450347/normal_5fee9f0551129.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekivuxuga.pbworks.com/f/vewovoxuzadel.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144423009/how_to_reset_summer_cadet_baby_monitor.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144478656/jaferuvo.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/spotify_premium_beta_apk_2021_offline.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/gozojimesinasuxewefowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb54bdd-8361-4339-80e4-556379539d15/what_was_act_1_of_macbeth_about.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144411963/58717030802.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/summertime_saga_mod_apk_free_download_for_android_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/874f42b4-aa0f-41ca-841f-5041bec7e419/strength_training_exercises_free_weights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57353ae2-f3f0-41f7-9b86-6db5cc92df8f/9420362228.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/movezezabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db956cf-13f5-4acc-950f-262e35c50862/how_to_hack_striker_in_carrom_disc_pool.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_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 5808 bytes
SHA-256: d937cd3fa3c9f9d8efe31ab6d613cdc35799544c74e36bc40209857fdb36b44e
font_01_sfnt_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 10828 bytes
SHA-256: fc0e06684af5d2144f5b0b672c29e59cc1f04d256b4ed11602c0aca0bdff6f49

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