Malicious PDF — malware analysis report

Static analysis result for SHA-256 68aa313f70998158…

MALICIOUS

PDF

89.3 KB Created: 2021-03-12 02:59:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 85bccba4a4c7db9ccaece2c88f7e7f6d SHA-1: b35d21c78592886ea5ec424f8eec68b5c8301079 SHA-256: 68aa313f7099815811ac181cf23bee97cd750eae3c88f86a8153d783977223b6
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a "Cahier des charges site internet exemple pdf". The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=cahier+des+charges+site+internet+exemple+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_5fe829525da2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_6036b52aa1d35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470688/normal_6008a60a2f575.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/kojalaxefu.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/how_to_write_roman_number_100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459055/normal_5ffc8b8e8923f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_6037f9feb81de.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/jbYAAij/31453953575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486566/normal_603f41f8c0122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459922/normal_6047a7e608a95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401711/normal_5fde5aeb82ab6.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/dkjjcib/dino_pet_simulator_roblox_codes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/kaniwoxud.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/nedbank_bursary_application_form_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/85699733658.pdfIn PDF document text
    • http://livirava.atwebpages.com/behringer_xenyx_x1204usb_driver_windows_10.pdfIn PDF document text
    • http://wififeju.atwebpages.com/how_to_become_a_trustee_of_a_college.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://scripts.sil.org/OFLIn 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_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 5540 bytes
SHA-256: 1be85cfb867fe070ef7b94460d950a818f742bc28d960f0f1b6f4b6407251267
font_01_sfnt_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 12192 bytes
SHA-256: 126f6e288b14154e3c944bd545329e7d30878f59a004f5c8861aab99e8b86f00
font_02_sfnt_off000140e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E6 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61

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