Malicious PDF — malware analysis report

Static analysis result for SHA-256 175ad08e8d263c31…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 00:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 891fab74d6bf45e10be21e214d223dc2 SHA-1: e7b4d82f572de568a57665c748772b7c73aff101 SHA-256: 175ad08e8d263c3145d37a92ed73d2dc7257063080f41765d2d9f5986ce4e678
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of multiple unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://sourceandsecure.com/uploads/userfiles/file/tikewozedawesuzedaxeku.pdf In PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/94087345983.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/mimonewujufupalepebulelav.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/giniwino.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/bazelawuvunisote.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6fb2s66ht5bh46rq1nvebpfuu0/kawufoxijivupufos.pdfIn PDF document text
    • http://anpharma.net/upload/files/masetej.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/mobutot.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630971052.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/45515015096.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/xowagawisubewowosezisapur.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/tebimopedazegure.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/kesujisusi.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/velavidinowuwatujuxar.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/kemobiwumunepewa.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/82235613537.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/fisoxera.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/82146191935.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/48128434966.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/27d5546e05b8cfaf6932d31193ef33a0/54752880474.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/10998929121.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109121803585297.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210914141421.pdfIn PDF document text
    • http://hkwwta.org/userfiles/20582402230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fifty+shades+of+freed+full+movie+englishPDF 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_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 11060 bytes
SHA-256: ecb465154dbfa237c4380d7bcf2413f4b5432c93d7d5e5b874286321cd0f2bc8
font_01_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 18800 bytes
SHA-256: 95404c5cd9134b677babe2b22ad315e112905f1527e4939d0cc912fb1ef4d2f1