Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0991d57f160fce…

MALICIOUS

PDF

84.3 KB Created: 2021-09-22 14:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e454a48f4c4d46b6792bc70159bee4e SHA-1: 1f570177c08a48a5004af4a07caa3ea11472f1c8 SHA-256: cd0991d57f160fce99e37f17fb2424e4fc89ab45adbede178ad499068db2b975
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://duepassidalcentro.it/userfiles/files/wudisutoxanifuw.pdf In PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/64912740630.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/1836609932.pdfIn PDF document text
    • http://xn--bqrr0jw6bmw2g.com/userfiles/file/1632254131.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/51129338836.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/ximopowo.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/77356382920.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/91051307346.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/porewaxolelu.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/42530399671.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/13196574386.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff1605bbea---79752965494.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/vosesinowowarumofog.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/fuwovaw.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/pajifaxazixuz.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/zutaduvikep.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/mujibitisamonumivufer.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/51679011790.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/75729395430.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/73423033580.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161483c2d742e4---61254904882.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/nixivulupasiwopep.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/kojuwuwufudixukov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=filmyzilla+web+series+2020+downloadPDF 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_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 10928 bytes
SHA-256: 3259c6eaccdf73e4c7ce550b715052989c711501d1693c4db579c11bef9adff1
font_02_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 18276 bytes
SHA-256: d795301a52adb54ba2e33a959bd3d72d3b0347f10f88e6e1787d67ff7bdf77e0