Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc48ef545ce05b6…

MALICIOUS

PDF

146.2 KB Created: 2021-03-01 12:32:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 639fbcc56e7d1cf8033f20a76a82ea17 SHA-1: 8068b5795c9b4ce14671f2d03804d2e4801464aa SHA-256: 6fc48ef545ce05b6bb80520535c64538e7ed77d03d29d7194924297c9eba749c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to PDF creation, suggesting it's a container for malicious links rather than legitimate content.

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=libro+de+lectura+para+primer+grado+yo+solito+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464529/normal_5fdc00e11a216.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/20332983732.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/kljjhec/black_french_tip_acrylic_nails_coffin.pdfIn PDF document text
    • http://migerov.xyz/bcbsil_member_claim_formf2jbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_60325c71933ae.pdfIn PDF document text
    • http://austritkfa.com/naminizebaqjm2i.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/jcZ3HnG/33038919519.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/who_manufactures_toro_snow_blowers.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/ncis_the_river_styx_part_2_recap.pdfIn PDF document text
    • http://zofokesagofot.22web.org/30573812787.pdfIn PDF document text
    • http://kejamezegujoz.iblogger.org/40312550604.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusegewamuzazod.epizy.com/kifizilabadisoda.pdfIn PDF document text
    • http://bavipilebevim.epizy.com/vigoje.pdfIn PDF document text
    • http://zokidogonaz.rf.gd/orchestrator_setup_guide.pdfIn PDF document text
    • http://jizivaj.epizy.com/3615915069.pdfIn PDF document text
    • http://rowesatuminef.rf.gd/metal_gear_solid_2_raiden.pdfIn PDF document text
    • http://gokozir.rf.gd/90798087605.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/62915822983.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_off0001f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F997 5660 bytes
SHA-256: 2bbcaac5052a00fca2924f64ccd745799433046dfc609c0a52491f66577b815b
font_01_sfnt_off00020cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CC8 13724 bytes
SHA-256: a0c3f190b79750cdb7b02d1c7b04dc95b2fc301bd561a6f37f2f06f175ac779b

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