Malicious PDF — malware analysis report

Static analysis result for SHA-256 064f3ca7ddfec3eb…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 03:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5772a6eb9a99c06d71d4ed2fdbb3861 SHA-1: d0cbd6a0f46664a4fe702c2559bbaf2ab49d1f7f SHA-256: 064f3ca7ddfec3ebf52b7f27d3848ccda9e3422709c926c16f1f1373564614f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, including one pointing to 'inwebjor.ru', suggesting it functions as a link farm or redirector to malicious sites. The PDF's structure and the presence of many distinct hosts in its link farm heuristic further support its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=tempo+magic+pro+for+android PDF link annotation
    • https://noithathoaphat11.com/upload/files/latelidulovugatikam.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/nexoromolajijaxiza.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631273316.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/72978809135.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/gebobuwozefowapivenu.pdfIn PDF document text
    • http://yjccnc.com/upload/files/jeluxotimasanagevalit.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/tofadi.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/kadigebedadaguxa.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/77283418999.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/gomudotubomuz.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/89031005169.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/33049431544.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/24401885334.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/56187582118.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/21723016560.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/21413035390.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/33161185434.pdfIn PDF document text
    • http://lex.tj/img/file/bajesufovibivokurez.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/20979489105.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/saxedabojavixumotapoj.pdfIn PDF document text
    • http://dogable.de/userfiles/file/30069259536.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19569912004.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/57768922786.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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 17112 bytes
SHA-256: 215650cd2b982a8a1b8457675e1b6129bcc388093d153850b82545b18badb3bb
font_01_sfnt_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 10612 bytes
SHA-256: 5f5072b2baa73db217734b868e19d58d4be49a658009b17f2a35a6b59ac1ebc5
font_02_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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