Malicious PDF — malware analysis report

Static analysis result for SHA-256 368c63180e10cecf…

MALICIOUS

PDF

77.4 KB Created: 2021-03-14 09:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3efb4ce7448947f9cd419d3c6f363c34 SHA-1: 96949ff01b10dacb9a381a18f7fe6b6e78822369 SHA-256: 368c63180e10cecfe73994dd62714a2cea295db1971d931e62d4e3559b189951
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The embedded URLs, such as 'https://nipisod.ru/award?keyword=bosquejos+para+matrimonios+pdf', suggest a phishing or SEO spamming campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/award?keyword=bosquejos+para+matrimonios+pdf PDF link annotation
    • https://cdn.sqhk.co/baluwofuk/GGzhgLc/to_do_list_app_iphone_android.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/he2jfjd/62779346661.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/uoiemjj/pixusolufun.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/srLheIb/galaxy_s8_ringtones_for_contacts.pdfIn PDF document text
    • https://cdn.sqhk.co/supuzeren/IetR2ha/sabewik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_602608078ad9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485821/normal_6029dfdfead6d.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/1iegdk9/vikings_war_of_clans_fast_influence.pdfIn PDF document text
    • https://kixorixoti.weebly.com/uploads/1/3/0/7/130740187/f9f1bbd9eb4.pdfIn PDF document text
    • https://cdn.sqhk.co/kubasovusi/R7jjjbk/carpenter_wood_cutting_tools.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473890/normal_5fd6e0728b117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408993/normal_5fe5eb8e04f71.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/i2mP2hj/zombie_fun_run_near_me.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/furomuzilevitugad.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/todeti.pdfIn PDF document text
    • https://cdn.sqhk.co/savimatuv/rhcihje/zetiledaxiwewu.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/hfbqjf8/cracky_egg_easter_games.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/dazawojob/vermont_castings_intrepid_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/93026269086.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_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 5404 bytes
SHA-256: d2e07cf7e5d26c233873eb5186109a7a8af5022aec14943543a9c311a147ab75
font_01_sfnt_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 12372 bytes
SHA-256: f693f2d185d59c8327438bd1f29840ed045f765a77f379e5e2114eba203be5fd

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