Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf312e085ab9905…

MALICIOUS

PDF

92.6 KB Created: 2021-09-13 20:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c8b68810b000f108fc4cf584956fbf2a SHA-1: 10108bf9fc6a61cf943a5529555f0a8508213a6b SHA-256: bcf312e085ab9905774c98ff7e6c737f7e487db25046f9d239332db431005b84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the final destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern, indicating the document's primary purpose is to redirect users through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 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://heritagecambodiatravel.com/userfiles/file/73196500355.pdf In PDF document text
    • https://kuzeyilac.com/resimler/files/71225656563.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/74697631088.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/wirored.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/gifijasilodab.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109120103355436.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210904195913.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/ginupili.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4339b8059---94488051603.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/nezijawigerevag.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/nokusabar.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/10154365892.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/5800926717.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/77094027469.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/puvetozisudexuzibizozitu.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/63101553051.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/91315744225.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/1829479157.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/9671932104.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/18014986986.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/22280507949.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/84522774460.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/nurerejinozugon.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/33251707924.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/51382411227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=short+haircut+for+square+face+female+2020PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 11060 bytes
SHA-256: b3612523613a17e4751217e30638883a46c9bf7e785d17f3e5da2b6f2832f2c6
font_01_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FB 18196 bytes
SHA-256: 079d36d8e5568a5a07ef650de3fdc6822900affa2ae242f1ac2bdac4d150670b