Malicious PDF — malware analysis report

Static analysis result for SHA-256 36da973995521c13…

MALICIOUS

PDF

77.9 KB Created: 2021-04-06 23:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 914fbe9552e024c0c37384265d0984a6 SHA-1: 28a889f82ba179bf6f1e0469e9aa60a9e434bf5b SHA-256: 36da973995521c134fe163c5b754041a7384bbe130fc9e82999f5f61ff916699
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious and contains a large number of external links, many of which point to disposable domains or are used in a link farm. The document body, though heavily obfuscated, suggests a lure related to 'introduction to macroeconomics exam questions and answers pdf'. The presence of numerous external links indicates an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://seumenha.ru/strik?utm_term=introduction+to+macroeconomics+exam+questions+and+answers+pdf PDF link annotation
    • http://216tilford.com/beyond_enemy_lines_2_reviewudgfx.pdfIn PDF document text
    • http://slimerecipe.org/computer_programming_jobsb5r7o.pdfIn PDF document text
    • http://how2clever.com/bovegexikonojojmprox.pdfIn PDF document text
    • http://premiumpornclips.com/67162271029zpr25.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/jigCPhd/90258225274.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/jwjbiig/bullet_echo_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/ihjaNgg/pivunajevavol.pdfIn PDF document text
    • http://qrettalq.online/zopilujezadenokajefakupipokicl.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/OhchdBY/mafunevapuk.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/5CGdJzp/kamigemaxawebuwonuwewajav.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/jdjcgf5/bike_xtreme_java_game.pdfIn PDF document text
    • http://mushygushysayings.com/nizanoxoruxo0kel5.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/jljj0Ex/14214933121.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_83df2e42e882406d82ca9e20e77e4bb9.pdf?index=trueIn PDF document text
    • http://ronojegev.rf.gd/watermark_document_free.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_761c2716d6b348eab1b41d48b7462dfc.pdf?index=trueIn PDF document text
    • http://gidigeja.rf.gd/pobovagugizitaj.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_3f782226dbc84875bb7f639f65c01509.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_8bf67e3d94404c4c94f8558b14036da8.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_d3fd76c3a08f4f2b914b0b2832fb826c.pdf?index=trueIn 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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 5492 bytes
SHA-256: dd077e5604276c917a05ba3dffd729bbbbd86d029b3fa594c711ab004337258e
font_01_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 10852 bytes
SHA-256: d1cdadeaf7ef618bfaa0c77e7b577fbdcf6a6ba5edcd704e64f8750195ee5ce9