Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3315f0955d67fd7…

MALICIOUS

PDF

83.0 KB Created: 2021-05-05 11:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b51552cf122e0afbe19004b8a87eb83a SHA-1: 5214133bb0cfb6608c4f62ff182af21f37c37741 SHA-256: e3315f0955d67fd71bc8fd8e3660a636f9341cebd9d9d9bad3e9ecb3b7842dd5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://crophysi.ru/strik?utm_term=dune+board+game+rulebook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466135/normal_600d90832c9a1.pdfIn PDF document text
    • https://cdn.sqhk.co/xaderipamuva/9KPhiCv/69045176111.pdfIn PDF document text
    • https://lijanitog.weebly.com/uploads/1/3/5/3/135309202/dapazazodusogipagu.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/2ORjbyf/mini_dachshund_breeders_pennsylvania.pdfIn PDF document text
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/lotesamavuxubib_fizovuxu_kesapugepanizog.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/JgiThje/carrom_board_game_download.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/cdbc7.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/is_the_game_show_the_wall_on_tonight.pdfIn PDF document text
    • https://fumamefix.weebly.com/uploads/1/3/0/8/130873833/lilizodazadusomulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_602bee0f86b44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_6027f47de33cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_603c20e8a7a32.pdfIn PDF document text
    • https://lufetanajimub.weebly.com/uploads/1/3/4/5/134592974/462d1a22a5663.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/44455161455.pdfIn PDF document text
    • https://dijitisabotiji.weebly.com/uploads/1/3/5/3/135324222/724412.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/jgijrjl/lucky_songs_mp3_telugu_naa.pdfIn PDF document text
    • https://puvojokuxika.weebly.com/uploads/1/3/5/9/135985507/zazevakifi.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/82349043166.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473971/normal_5ff679fc12488.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/gjerhjy/88889400810.pdfIn PDF document text
    • https://vuganolo.weebly.com/uploads/1/3/5/3/135314000/65aceaef3e93428.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/vepulemefasivoxaxof.pdfIn PDF document text
    • https://berijuwijupev.weebly.com/uploads/1/3/1/6/131637896/munozivukuga-vozezovuwudokan.pdfIn PDF document text
    • https://xigunokitipir.weebly.com/uploads/1/3/4/6/134615451/dd62153666.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxiruvud.myartsonline.com/fodukode.pdfIn PDF document text
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_5a3c465071224dc2b290fc38389a4e80.pdf?index=trueIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_4a0e847dd5034edcb2c961ef4e4cc215.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_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 5388 bytes
SHA-256: 6ad57fe4378b35d3beeaeed2fd52cac7b027a945f5e5d38cdc09b4e0540390c3
font_01_sfnt_off00011ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 10356 bytes
SHA-256: 9744ece6a96dcbb4e38619c34daf85d35852bc5b3c634b3054d1de86343d1ea5