Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cafc31bbb9e8e4f…

MALICIOUS

PDF

72.6 KB Created: 2021-09-13 10:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17246f63c36df7236bfa0951968dc93a SHA-1: cc7ecba0ca54d00c5b8e0e264c8809f6f21d1efb SHA-256: 9cafc31bbb9e8e4feb202a70dface6dc8f30c9973cebd501cb81a3f376a362ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://travellifeafrica.com/ci/userfiles/files/sutux.pdf In PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/takosofusulafumurozorewin.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/mifinanasimoselakis.pdfIn PDF document text
    • https://subarini.ro/mm/file/fefiwofewijafopadozopew.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/l1l0b4ffsoetpi7d5bo7r0lcd7/terone.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12730457360.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/22258243633.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/79088975170.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fijomumarugavinone.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/xenudalukekawevuwilew.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/6992574665.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/74870124316.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/xuvofapobidugebeful.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/rumumusigiguzesuzomedom.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/fojaniga.pdfIn PDF document text
    • http://ijfbn.com/editor_up/27570428782.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/8765376808.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/73479513214.pdfIn PDF document text
    • http://eichler-kammerer.de/73722238918.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/kavilararuban.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/40566542268.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/34969610187.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210906003826_732657658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=streamer+life+apkPDF 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_off0000bd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56D 16012 bytes
SHA-256: 171e3f153e4c26997978b84d4f50fcd8fe3adb153384747f350eeff904ed93f5
font_02_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 10292 bytes
SHA-256: 5f9664aa8d80f5340423e20ec481d452639079c2180e483d98aa06fa22cd2f88

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