Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4f46e4348fb547…

MALICIOUS

PDF

71.9 KB Created: 2021-02-24 15:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: bfa81a7bdf542c1055a4ad0305528b03 SHA-1: c58ae59dbebc2e5144be82d2ba6633797ffe2595 SHA-256: 8f4f46e4348fb5477e8b86f943adf852bde35fe8712de0f2b74ac5f8ca67d6fa
184 Risk Score

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/wix?keyword=u+boat+upgrade+guide In PDF document text
    • http://mp4.design/70952834009aictw.pdfIn PDF document text
    • http://mysteps.online/complaint_letter_response_templateac7fp.pdfIn PDF document text
    • http://birjand.design/comparing_and_ordering_fractions_worksheets_grade_4kha7x.pdfIn PDF document text
    • http://moresukko.ru/standard_operating_procedure_manualc13qq.pdfIn PDF document text
    • http://boevoenlp.com/746665385vv9ek.pdfIn PDF document text
    • https://kokodukitibov.weebly.com/uploads/1/3/4/6/134609001/zijisonorizosum_dovipozake_maluxuwov_detisazizerav.pdfIn PDF document text
    • http://labiosdewonda.com/repufuxowopupezunupz8ju6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419847/normal_5fca7caa1a882.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/pleasure_without_conscience_meaning_in_telugu.pdfIn PDF document text
    • http://allieshouseofhope.com/21136892270ulsdn.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/how_long_does_navy_training_last_in_nigeria.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokosen.atwebpages.com/5638522036.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/17887086712.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_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 5048 bytes
SHA-256: d254f5c8f04285779d7e2e5b2ca1589c434647198d35da2227f31dab4bca8100
font_01_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 10644 bytes
SHA-256: 22e7f36e6c506cf6ac24e92c4f8f38499425ef9cea9e55dbb262fd81ad2326f3