Malicious PDF — malware analysis report

Static analysis result for SHA-256 4701a90609f85823…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 04:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65a6caecfd5134d74ffd7be3cbf9b7f6 SHA-1: 2c7835f7a2ff5d44f7dc33ed20e060ff17c4d104 SHA-256: 4701a90609f8582373c733ccd8afa9d714d9cfb256565ece09f866d09fb2fb9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=how+do+i+make+a+live+wallpaper+with+sound PDF link annotation
    • http://phanmemerp.vn/attachment/files/42142698441.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210910_044609.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/regug.pdfIn PDF document text
    • http://zerosquareonline.com/file/dokezugiwazaxoposomonoga.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/sisoloxalekujexejoleguw.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/rumoxojawuxiwazu.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/75373965956.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/75857162685.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/20741678419.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/98861628166.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/rosotugumej.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/18517505.pdfIn PDF document text
    • http://sinostandards.net/upload/files/77016540697.pdfIn PDF document text
    • http://medi-sen.com/files/files/somobewexezapurijo.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/8657245056.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/62258175539.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135aa7e2c9fe---benage.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/32851309799.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613763217e207.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/44456954111.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/78456807226.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/dusulineruwizu.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/betareretulosobigivuvupi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6a0a5b6306ccc1b1f9a5b26f4ee6a1d2/28191304490.pdfIn PDF document text
    • http://maidichike.com/upload/files/gixepi.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210912070231_2w7c7e.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/87167896313.pdfIn PDF document text
    • 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_off0000cc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 16984 bytes
SHA-256: ca7a8aab0af66eef96d7c8edf8496c3c7dbef918e5787fe30b50fa803663e033
font_02_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 10992 bytes
SHA-256: a880f33934227e1a0855c0d7ce9628c45fd161f7ac61ae265bc7001c82ba5be3