Malicious PDF — malware analysis report

Static analysis result for SHA-256 337247ad27485738…

MALICIOUS

PDF

85.1 KB Created: 2021-05-06 03:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2aa5f4383d01f756cbd24792b544b757 SHA-1: e1fd9bc3436b42f19e7a1bd26695121353786820 SHA-256: 337247ad2748573855df8fcd1457011b924647a299b99c1fa1e6f11df762f502
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though partially corrupted, suggests a lure related to dog breeds, which is then redirected via the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://dafemum.ru/strik?utm_term=how+to+find+out+which+breed+of+dog+is+best+for+you In PDF document text
    • https://static.s123-cdn-static.com/uploads/4489722/normal_5fde82f8932f4.pdfIn PDF document text
    • http://telgrm.site/4291770280988p26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456379/normal_5ff14dc81bdf9.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/8273587.pdfIn PDF document text
    • http://jumbochecker.com/23964755341rp86c.pdfIn PDF document text
    • http://eslife.pro/lusetidegafaganeu3o8c.pdfIn PDF document text
    • http://useplafond.xyz/why_is_my_nespresso_machine_leaking_coffeer0s45.pdfIn PDF document text
    • http://2220202.ru/math_worksheet_for_6th_gradeg0p75.pdfIn PDF document text
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/bowowozasifirajukewu.pdfIn PDF document text
    • http://vodoroding.info/auto_increment_primary_key_room_android96s10.pdfIn PDF document text
    • http://d-youtube.com/77987969240nbjw6.pdfIn PDF document text
    • http://modernstyle.pro/womigivudugof7hauy.pdfIn PDF document text
    • http://tugrull.com/mifob44c64.pdfIn PDF document text
    • http://organicnu.info/52466900862wglza.pdfIn PDF document text
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/mubekiboza.pdfIn PDF document text
    • https://setabuzi.weebly.com/uploads/1/3/0/7/130775645/37ce276e112a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dilexaluv.epizy.com/what_software_do_famous_writers_use.pdfIn PDF document text
    • http://lulorabero.epizy.com/42109013784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0eab4f-bc7a-48ff-a7f2-1d3d74539d2f/kawet.pdfIn PDF document text
    • http://vufobaratoja.epizy.com/88811607198.pdfIn PDF document text
    • http://bumunosusub.epizy.com/adjectif_possessif_fle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dad51b0-68dd-47d7-b1e0-42cdc23908bf/manual_veeder_root_tls_350_portugues.pdfIn PDF document text
    • http://wupewujivijulo.epizy.com/exhalation_stories_by_ted_chiang.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 6160 bytes
SHA-256: a212905858870b9339a5c792a18e189311f9ef8275e412f5e69e3f11759cc97f
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 5336 bytes
SHA-256: 851f7749a7e504640d9b9cb9b6bc0d5a902e2a8d73c2442e143cc7387977a8f2
font_02_sfnt_off00010932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 11668 bytes
SHA-256: 1a98fd73f2de23e01cc4ae3cc93fe3f82e91cebb29d2e776a645cc42fc58e35d
font_03_sfnt_off00013094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13094 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e