Malicious PDF — malware analysis report

Static analysis result for SHA-256 510284bcf0bd99cb…

MALICIOUS

PDF

70.9 KB Created: 2021-09-09 17:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 969467aea4e7eb9b6fc1a12da251694a SHA-1: 2a92b361e55414bb8db259354ac29f6de30ed4bf SHA-256: 510284bcf0bd99cb25f27fa5aa4f545726cd2be31d27fdccd3df47454cd82ada
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including random and disposable URLs, and a high ML score. The ClamAV detection confirms its malicious nature. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inprovitcolombia.com/ckfinder/userfiles/files/wupuzegil.pdf In PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/xejokebemobinemem.pdfIn PDF document text
    • http://prmakeup.com/Image/files/vavexew.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/27967689930.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/70329452331.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/tefevafuwi.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/51691725269.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/48471104735.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/mogupajoxegamaridozali.pdfIn PDF document text
    • https://mar3ol.com/Files/files/63980812502.pdfIn PDF document text
    • http://nprofit.hk/userfiles/gidenalid.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/56783742518.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/77005212344.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/gujupufuguvisujenofoso.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380be6cf3ed---88204874740.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/32179613954.pdfIn PDF document text
    • http://czminghe.com/upload/files/watumeretadore.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/87196729688.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/8100900059.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/42800551364.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e28877f234cf64d0c8e67071a32116b0/83867868172.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090503481773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=spm+test+in+psychology+pdfPDF 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_off0000b48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48F 15568 bytes
SHA-256: 18e998277805fdd5be6d1109362b011243ae553ef70a4c9ade4302cdfd9cc3da
font_01_sfnt_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 10996 bytes
SHA-256: 8cd141d53ff3a40178c15f3213b286ebf7e599134d05126869ce9a7e9aeac236

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