Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd4d87b2e4f1401…

MALICIOUS

PDF

102.9 KB Created: 2021-05-09 17:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9fd2371ac64327ea87ed4472f56bb2c3 SHA-1: 90763925cfca5f5c61785d8fee25638dc9d90e86 SHA-256: afd4d87b2e4f1401801aeb661f77e5c3163977fd89cde77b3429a21905564cf1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The document body, though obfuscated, contains a lure related to crafting, which is likely a pretext to direct users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://yafferge.ru/strik?utm_term=how+to+make+a+hooded+cape+without+sewing In PDF document text
    • http://mokemowowove.mygamesonline.org/72577169496.pdfIn PDF document text
    • http://wizapivizesib.mygamesonline.org/59752850439.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/tetipifuxopotesanuj.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/adobe_illustrator_cs5_tutorials.pdfIn PDF document text
    • http://trells.space/linear_inequalities_in_two_variables_word_problems_worksheetv3ql9.pdfIn PDF document text
    • http://itasummer.fun/controls_and_systems_electrical_engineeringe5qiy.pdfIn PDF document text
    • http://xokijaxano.medianewsonline.com/air_france_klm_annual_report_2020.pdfIn PDF document text
    • http://qwert-ita.fun/99933739948d04s3.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/amoebiasis_adalah.pdfIn PDF document text
    • http://astropsychology.site/palmistry_book_free_downloadeh3wr.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/kovadidavujesukuniz.pdfIn PDF document text
    • http://verifedform.com/pinofp582k.pdfIn PDF document text
    • http://aycotoro8.xyz/woruviviwetivosonejejirh4lxe.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/wiwok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawidinivetobi.myartsonline.com/zolosedozule.pdfIn PDF document text
    • http://butorinowu.myartsonline.com/36766909172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199ebec7-33df-4452-8474-47ee642cfaec/aztec_number_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b03f17-0b46-4fe8-b880-b98163ce8f5f/57646098528.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/pate_hollow_trail.pdfIn PDF document text
    • http://vulopekusape.atwebpages.com/satigotufewuriduz.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/32043617086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dcca320-677c-49ef-8a2d-5694d9c7a742/wukugibefegatadusolubumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fbe96fc-57f1-4872-a821-b692dbea2614/top_1_10_scale_rc_cars.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 5476 bytes
SHA-256: c36c3767ebdaa9c14e6fdb88288948794475dc86202b46bf287c6dbd41faed44
font_01_sfnt_off00014548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14548 2744 bytes
SHA-256: c58734b7c43f876d00250fe79027c28030c899bcb97b97a165465ed91b27eb93
font_02_sfnt_off000150f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F2 11048 bytes
SHA-256: 14fcb2cdbb53f44e8a6053d99f7ea8887b6e8324d4dea6dbfdc0851d986f533c
font_03_sfnt_off000176bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176BB 16696 bytes
SHA-256: ef5481b8d34d4c37247233e293470d90c49ac8130640bbc7741fbdd290b1cf4a