Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0be5af43da86296…

MALICIOUS

PDF

74.8 KB Created: 2021-02-18 04:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7856197bb5f0a530e3053b5fb1d9a570 SHA-1: 5f51f8b595e45b9208dd58b8e6a2da154395a7db SHA-256: a0be5af43da862967a2db41142f3ec4c3d2ea90d6583962f179804dc0ab256e0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to 30 external PDFs. The primary external URL, 'https://jacksth.ru/aws?utm_term=why+is+my+electric+underfloor+heating+not+working', suggests a lure related to a common search query. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=why+is+my+electric+underfloor+heating+not+working PDF link annotation
    • http://teachersaid.fun/american_standard_freedom_804k62s.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/diihifh/photo_video_maker_with_song.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/YhbgcO1/pekolenagakawaxubulu.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/datujivopo-nijipono-texazozurajoza-torevi.pdfIn PDF document text
    • http://espacecmb.xyz/68088057850fqkvu.pdfIn PDF document text
    • http://meetdouche.xyz/allure_report_historyiio3u.pdfIn PDF document text
    • http://raisinshq.pro/blues_songs_chords4gk0r.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/how_to_write_book_summary_in_elementaryxyrzk.pdfIn PDF document text
    • http://labiosdewonda.com/Kubnske_detsk_prbehyk2t39.pdfIn PDF document text
    • https://cdn.sqhk.co/lonubugogere/DaTAjgQ/uptv_bringing_up_bates_blog.pdfIn PDF document text
    • https://dixevivoruze.weebly.com/uploads/1/3/1/4/131437918/narasomun.pdfIn PDF document text
    • http://nakrutkavk.site/verasepusiravawukimikiudzq7.pdfIn PDF document text
    • http://asta-stroy.ru/islr_introduction_to_statistical_learningecjmt.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/dumupa/bapalifilatazebesi.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/99877038577.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/beauty_plus_camera_apk_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/12723079138.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/bodubafupowo.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_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 5704 bytes
SHA-256: d1163052e36e171bd5777af685798cff5d9be9039d525cf858d1a4af6ae15cc3
font_01_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 10840 bytes
SHA-256: 826d152bb82af571107436262a38d532683028b02dbbe7df711e5236d3261716

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