Malicious PDF — malware analysis report

Static analysis result for SHA-256 016fd7936f177f4d…

MALICIOUS

PDF

79.4 KB Created: 2021-02-20 21:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1a9882f41f64be0b6944b8caec8c37b4 SHA-1: 1c2a799266b9d8e6357a3c1e36205766375d3046 SHA-256: 016fd7936f177f4d29f5699e198c619787a18407b8da19a3a6786f1573e037bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or distributing further malware. The ClamAV detection further corroborates this assessment.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=twinkle+toes+dolls PDF link annotation
    • https://dibarovufi.weebly.com/uploads/1/3/0/7/130776786/bokewam-makuputit-fepetuzowakulep.pdfIn PDF document text
    • http://wurijudopala.22web.org/keketap.pdfIn PDF document text
    • http://jixusigelabewe.iblogger.org/24835841856.pdfIn PDF document text
    • https://sujosajuzatitoz.weebly.com/uploads/1/3/5/3/135312362/bilisemegevi.pdfIn PDF document text
    • http://burrrhey.tech/ikea_catalogue_2019_uaeb4n7a.pdfIn PDF document text
    • http://ru-en.xyz/90360303524atgwo.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/pofodopoxukilosirlc99.pdfIn PDF document text
    • https://cdn.sqhk.co/bulamije/chfjjjf/fezusoribojemorutizo.pdfIn PDF document text
    • http://richteam.site/photo_lab_cracked_apk_downloadteppf.pdfIn PDF document text
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/zosivulerus.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/ichjyja/4_pics_1_word_4_letters_leaf_dice.pdfIn PDF document text
    • http://freedate18.xyz/cambly_free_apkbm5u1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rodaselawowov.rf.gd/photoshop_free_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/attu_movie_songs_ringtone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 4404 bytes
SHA-256: 6a29b6012262572e9c5144804c2bde51453ed172aaf746406c1d52004b7b5863
font_01_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 10308 bytes
SHA-256: 8609d32339db2aa4720d1c54eec00fb79c08ad95561b2ba283bd14c6245ca6a8
font_02_sfnt_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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