Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04fc5afe2a9d546…

MALICIOUS

PDF

73.1 KB Created: 2021-09-15 19:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bf507c44554d3a64f620237db1410ee SHA-1: 2e28d42ba33b1aafa2f30583dac2da2142f3fd40 SHA-256: f04fc5afe2a9d546aa05fba3ce61c74678448d2090eaea1c19f0759a0af915ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for distributing malware or conducting phishing. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external links suggests the primary intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=hack+dawn+of+titans PDF link annotation
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417f0f4f3ea---69499616346.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/vogariwaliteguxepojemo.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/gumirawinowolugiwudetadok.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/putesumamemitodarosadi.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/pifepanaxuzojuseri.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/zenusijamugawifijojusug.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/rokizet.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210910135658.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/15870854537.pdfIn PDF document text
    • https://chp-travel.ir/data/file/42771237214.pdfIn PDF document text
    • http://wdnederland.nl/file/tedexed.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/84823482430.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/14966623196.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/wetebanemere.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/seteguwamekudexazimomel.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/mezomus.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/woluvakugidewawuwaborob.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/fawiwuso.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/35521318005.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/74824487427.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/45654402669.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/51896348253.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/16236740882.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/80763946496.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/webigolotabinozo.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/fibem.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_off0000bcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 16508 bytes
SHA-256: 29c9f7315d4d2485900c4eaf9e4da40e19e7672694e3e7dab28d47f738a466df
font_02_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 10360 bytes
SHA-256: 3785c8866fe63c57b7ccdb8766730f1e84493f8bfd2ac7251b60890654828e75