Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bfb80c6b76d607…

MALICIOUS

PDF

77.0 KB Created: 2021-03-19 16:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c84bed2183b4325070100f4e5d6f945a SHA-1: 2803b580eac7254a60aaf62ac4ce80987e1b9b09 SHA-256: 59bfb80c6b76d607a3257d757c8fd3a24b527f1977ff199ba9b00f8bafeb4ad6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links suggests a drive-by download or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=bluetooth+headset+connect+to+laptop+windows+7 PDF link annotation
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/5362c20d098.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/ijjKL9A/rainbow_light_poweramp_v3_skin_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/egjIlij/perfect_homemade_ice_cream_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/WjdDwhf/coolest_fact_about_human_body.pdfIn PDF document text
    • https://zujavezamuni.weebly.com/uploads/1/3/0/9/130969293/23b7253738.pdfIn PDF document text
    • https://cdn.sqhk.co/vuranataxu/hgicigF/gozerixuxoxekisavevomuvut.pdfIn PDF document text
    • http://kpupnov.pro/mujibovaf8h8rx.pdfIn PDF document text
    • https://cdn.sqhk.co/savadapo/bPihBij/steven_universe_character_creator_game.pdfIn PDF document text
    • http://blognews.top/debt_snowball_calculator_online_freeain0v.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/gazivemon/android_auto_media_app_development.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/just_juice_apple_juice_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/48352078197.pdfIn PDF document text
    • http://mulubixuzu.epizy.com/lord_of_the_rings_piano_sheet_music_medley.pdfIn PDF document text
    • http://jagivaxo.rf.gd/gokuxajumivekajowisidol.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/55657204058.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/ashton_drake_little_peanut_doll_reviews.pdfIn PDF document text
    • http://lusaluvogegut.epizy.com/bhole_shankar_bhojpuri_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/acronis_universal_restore_iso_image.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/tracking_app_for_android_tablet.pdfIn PDF document text
    • http://lukigek.rf.gd/bejisamuwexezilesax.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/budget_excel_template_personal_finance.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_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 5284 bytes
SHA-256: 1bbc453e4faa10b01f1c2e269d6975248e6c51d9e495b213ead53507eba5b2ab
font_01_sfnt_off0000fe33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 11744 bytes
SHA-256: 88f039a37a7d4bd89395ed65fbf8ce3d121f435481a81622eb97e9efec62b54c

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