Malicious PDF — malware analysis report

Static analysis result for SHA-256 75104cb5bf8e42e5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 02:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52a85a63bc91e2a1a27fad30c430dbbf SHA-1: b298ae752217088484dfb019b8580ac5171db6fe SHA-256: 75104cb5bf8e42e56f2145954d5bdd92fef87d392785d8b3c1d6d8306378ee1a
134 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to potentially malicious files, and a heuristic specifically flagged it as a link farm on disposable hosting, suggesting an attempt to distribute further malware. The presence of a 'download' button heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ocptecnology.com/admin/uploaded/fck/file/40955447471.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021090819200373499.pdf
    • http://m-s-g.ru/userfiles/files/1867132106.pdf
    • http://gzcil.com/uploadfile/files/66614124160.pdf
    • http://contua.org/userfiles/file/dasepoderiti.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/22636936866.pdf
    • http://ttc-investco.com/img/files/vijobam.pdf
    • http://tykhchem.com/upload/files/4036411780.pdf
    • http://c-six.it/userfiles/files/gakenovaxipigatewofidob.pdf
    • https://commonlawhouse.in/userfiles/file/zigazizopaposama.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/jonemizosawu.pdf
    • http://champagne-marc-chauvet.com/images/files/97368104731.pdf
    • http://k1a.ru/images/files/file/82289046922.pdf
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wowenuzexirawoxa.pdf
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/duxuvotipupofogo.pdf
    • http://dealershop.es/userfiles/file/vosomuvire.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/2031377180.pdf
    • http://bielle-srl.com/userfiles/files/13947191844.pdf
    • http://wsystem.sk/userfiles/files/12601057568.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/427198ceef141b27896decdd66e055bb/rerokabojupawefi.pdf
    • http://grupopiscis.com/upload/files/39915856547.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/76896552170.pdf
    • http://lnianemarzenie.pl/userfiles/file/71966527664.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e8546875---nurixadobepes.pdf
    • http://bulgankhangai.mn/userfiles/files/98881198352.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=naruto+games+offline
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29f.bin
c4c2f178f71876591a7454eaa856e97b53279b694740ae7c32c6f9731c35b793		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 10636 bytes
font_01_sfnt_off0000faf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 16792 bytes
font_02_sfnt_off0001130a.bin
18449399ad3f8f04216097f951d8b42db027b99684a7e45398a49863be79ac2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1130A 18124 bytes

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