Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc838d28e383212b…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 13:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63d7a723afd68c5119e6464e9c01f218 SHA-1: 8724c6994b8290d4757779d650404bc471d8ed6f SHA-256: fc838d28e383212bb6ac0d8716e17fb0bc32268643bad84398387ebdcbfff402
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the document prompts the user to call a number. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs pointing to potentially disposable hosting are consistent with phishing or malware distribution tactics.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://allytemp.ru/uplcv?utm_term=custom+rom+for+j200g PDF link annotation
    • http://clinicaveterinariabilancino.it/userfiles/files/sozanepunusajuzumuxe.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/22064054299.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bc1j91qsusee0vomm5rosgr1nv/41026906179.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/73102711003.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/15393889911.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/gatuvunemuroxogu.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/47906724968.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/91782211398.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/gidewaz.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/dibikifidotose.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/2338594384.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/34608872476.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141bd27913db---jinagewadigazunawu.pdfIn PDF document text
    • http://mextro.de/upload/files/lenenazabewuzaros.pdfIn PDF document text
    • https://jensbrode.de/files/file/51423258663.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/jumediteforokuxiwilaka.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109090349199711.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/8880611119.pdfIn PDF document text
    • http://baoveantam.org/upload/files/33919921464.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/sijemav.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/28493454871.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/natuvabijiwiw.pdfIn PDF document text
    • http://dentherapia.hu/files/file/gilizidamenalimamig.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_off0000be64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE64 16500 bytes
SHA-256: 511a897edaf5268bf97771d8414b238e02f09778f45b82f548662c58f4e00eb7
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 10524 bytes
SHA-256: 59d329fcab33173b04f758735fc33de82af427924f1426b2815e6d0e876168c1
font_02_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1