Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b490599af40783…

MALICIOUS

PDF

67.6 KB Created: 2021-02-14 15:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b4a98abfa5d8f3d273f026c848c5be5f SHA-1: d43e82de80ad4c7a58ec743a82577746f4b629a8 SHA-256: c2b490599af407833a4c46f26236b2271306058db5c20f83aec5b59d315974e6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to disposable domains and redirectors, indicating a phishing or scam attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'crophysi.ru' as malicious. The document body, though heavily obfuscated, appears to contain search terms related to academic materials, suggesting a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/123?utm_term=pearson+drive+right+eleventh+edition+chapter+6+answers In PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/pogepexezid_gerabibejo_guwonom_muwebuzofu.pdfIn PDF document text
    • https://pujawemufupu.weebly.com/uploads/1/3/2/6/132680931/dizowemewetegidowel.pdfIn PDF document text
    • https://zebaraxofalolal.weebly.com/uploads/1/3/0/8/130813897/9719514.pdfIn PDF document text
    • http://youla-24.cc/iwgdf_diabetic_foot_guidelinesddxv5.pdfIn PDF document text
    • http://natgood.space/8322542463ybw2i.pdfIn PDF document text
    • http://kimagibasip.22web.org/61990267722.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/80442839902tlmmc.pdfIn PDF document text
    • http://euromarket.pro/gobidutuz891.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/hiVMgjx/zojuwupixaxifomu.pdfIn PDF document text
    • http://vknart.xyz/la_forma_bidimensional_significadow2lts.pdfIn PDF document text
    • http://storezone.info/48325560509wu4u4.pdfIn PDF document text
    • http://topshops.website/2081830406xe5wr.pdfIn PDF document text
    • http://world-wildshop.com/taxi_car_driving_games_free1clnj.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/y0ihJii/maze_escape_running_man.pdfIn PDF document text
    • http://xrootunited.com/aureus_primary_school_uniformf3ith.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/tipos_de_auxinasmk906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugekalamiwatek.epizy.com/megotoxukiw.pdfIn PDF document text
    • http://mekidojakad.rf.gd/4060544107.pdfIn PDF document text
    • http://rigutogivopum.epizy.com/mainsail_tuning_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 5644 bytes
SHA-256: 4541c2952a5bcf92e1840095cdb325d409bac8095a837f7debd26b4f28b12e5a
font_01_sfnt_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 9760 bytes
SHA-256: 61003262664e7bf095f272dcd5dab735788382c4e08fe2469772e447005fd568

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