Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c3b1541464cd61…

MALICIOUS

PDF

86.5 KB Created: 2021-03-05 03:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a9150ca85fe7e63dd4beae8f01c7aa1a SHA-1: 1242c474b90135113085dffa162279cd2a074e9f SHA-256: d0c3b1541464cd61eb510d363aa7fc81ebc3ebbc63a49925862a10062070e20d
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://crophysi.ru/award?keyword=fe+review+manual+3rd+edition+pdf+free+download`, which is indicative of a phishing or malware distribution scheme. The heuristic firings for PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly support this assessment. Although no scripts were extracted, the document's structure and embedded URLs suggest it is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=fe+review+manual+3rd+edition+pdf+free+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5fdf72324bafb.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/hajgifB/jutenukazuxak.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/uJjgqpL/76219279087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5ffacf8d5cd66.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/axiom_61_factory_reset.pdfIn PDF document text
    • http://fidekeleko.medianewsonline.com/navixilupunafidodu.pdfIn PDF document text
    • https://cdn.sqhk.co/gobejilu/bQgdjeI/goodreads_quotes_about_change.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/4Kgg3hg/zixuraporupetobo.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/bheCgjF/54394075158.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/f4lkhjD/68857694018.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/m_audio_fast_track_pro_treiber_windows_10.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/way_to_develop_lateral_thinking.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/how_to_explain_excel_skills.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/dasimafafavi.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/hNB3Yb6/visit_florida_beaches_red_tide.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/hjkgfgc/407001047.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wabupotobexuxu.epizy.com/pezerudubomonevetufa.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/56578058753.pdfIn PDF document text
    • http://medojowibapij.epizy.com/don_t_starve_hamlet_beginners_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 5160 bytes
SHA-256: 981dd5e825faaf5e2afdb350e55468ab7518e8b6b8f8d4868cdcb79917547a66
font_01_sfnt_off0001199f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 10852 bytes
SHA-256: aa253e7f007377aa4997f333e63a0dfbe8ce4c719e33bb369f537c36408489b9
font_02_sfnt_off00013e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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