Malicious PDF — malware analysis report

Static analysis result for SHA-256 2534397e642659af…

MALICIOUS

PDF

102.7 KB Created: 2021-02-08 17:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ed4fad05877a7630a69a40c2ff235852 SHA-1: 141690313eefc35813ca19e84a9b8ec3f1e3ef10 SHA-256: 2534397e642659af05b74846b62e5288bef30a3c88b0a9beb6e7e2269e10000f
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a pretext of an 'interim report' to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/aws?utm_term=interim+report+example+for+dissertation In PDF document text
    • http://feziweninepiv.iblogger.org/cookie_sheet_with_holes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_60164b7297b78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_6008ec101ec14.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/kicgfie/kivizuzonebedinisikuzuxew.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/dsMLhGn/raspberry_pi_4_steam_link_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368225/normal_5ff36acbd2ed6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448345/normal_5fe1916005657.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/kovezux/jejinezuvifuxiriginirejoz.pdfIn PDF document text
    • http://medelomozukomav.epizy.com/ramimaxemenawimage.pdfIn PDF document text
    • http://marelifi.rf.gd/kimapumogamowanake.pdfIn PDF document text
    • http://dagogedimin.rf.gd/format_ssd_ntfs_allocation_unit_size.pdfIn PDF document text
    • http://jepuvituxog.rf.gd/63953256336.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/36623251512.pdfIn PDF document text
    • http://pukowevuvifa.rf.gd/38063810056.pdfIn PDF document text
    • http://kititone.epizy.com/classical_music_beethoven.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/new_bhojpuri_full_movie_2019.pdfIn PDF document text
    • http://jerovewoxisabu.epizy.com/wozegozutazonuwafopajeriz.pdfIn PDF document text
    • http://pemukavejokawoj.rf.gd/nadav.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15578 5192 bytes
SHA-256: ea0ac3ff8f34ace90ab946be685f7a013dbb41be44f1de13ff5b9ecf0540f3b6
font_01_sfnt_off0001670f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1670F 11480 bytes
SHA-256: 279204146d80c4eb938b533b3ca57c71dcc39373cd3ec2877424df4b972ff272

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