Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f29cf387f4539dd…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 17:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cf5bfac7a0403f8bc065e7fb0b3eaddf SHA-1: deecc4cf5ad33a38ed4a024b014cf7921436f86e SHA-256: 4f29cf387f4539dd648a7447551be8a76e2be77347a2dbd1fdf30999e3cc52ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to phishing or malware-hosting sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=photoshop+for+android+free PDF link annotation
    • https://aspirecambodia-edu.org/userfiles/file/13720542439.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fojefuxap.pdfIn PDF document text
    • https://fong-cai.com/upload/files/14741599035.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/fifowilalofojo.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/sejipizirudulaxamisa.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/30826976505.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/feluj.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/vawaxi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/91666289523.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/66789574841.pdfIn PDF document text
    • https://akemi.ro/hirek/file/86227043113.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/68491638213.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/22293759182.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/64078458386.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/56357635749.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/neloxideseriwur.pdfIn PDF document text
    • http://393citizen.com/upload/files/89235445694.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/41132238975.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614682629df70---giwefavunamegibub.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/piletunepisezeregupabefu.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dabb11f3f7---tiradubimivakemasezin.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_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 17908 bytes
SHA-256: a49eea0bcc13e3d19a9adbd48ecdbbea6ebd933f6b148cec46e8aa9f6407c502
font_02_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 10548 bytes
SHA-256: c010462604584d5b7ecacb1aa4f3fa860ee8127c88eae95f5cf15aaa0f2194f4

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