Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c47c4ae55c9d58…

MALICIOUS

PDF

82.8 KB Created: 2021-04-01 00:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cfdaaf61c29f6d9ea08d4f7df5418af8 SHA-1: 7f3c193b769d1a37794c6d7489b96c6bbe832832 SHA-256: b7c47c4ae55c9d58752f09b4efd682d0000b204eabbb742e13d8a413745f1fd8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs likely lead to further malicious content or phishing pages. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=gimp+2+layers+tutorial PDF link annotation
    • https://galezarulunozip.weebly.com/uploads/1/3/4/8/134896955/zozenile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465389/normal_5fc5715ac1893.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/19gfihc/44897576124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_60229fbf798e0.pdfIn PDF document text
    • http://fuxutigox.mypressonline.com/87034223825.pdfIn PDF document text
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/ea8c858816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_604a804b27295.pdfIn PDF document text
    • http://wedurorokim.mypressonline.com/43508350901.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/AwvhbJm/81472443956.pdfIn PDF document text
    • http://xijivedijimidip.mygamesonline.org/kartilya_ng_katipunan_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393631/normal_5ff56959a963d.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/komplikasi_asidosis_metabolik.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/gcihetg/ice_age_adventures_animals.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_f8b87559ecb3467b88670cffc0588239.pdf?index=trueIn PDF document text
    • http://nevabaza.atwebpages.com/what_is_the_starting_price_of_g_shock_watches.pdfIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_cf102e4cf5824bb0908e216348d54035.pdf?index=trueIn PDF document text
    • http://pudugivifo.myartsonline.com/optional_attendance_form_tdsb_2020.pdfIn PDF document text
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_956453d1667e4d8b8677dc1439f7b367.pdf?index=trueIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_49796757962e4a7abdb8a39490609d46.pdf?index=trueIn PDF document text
    • http://sanugifop.atwebpages.com/constitution_of_pakistan_in_english.pdfIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_53b87ceb7a334180b5fa8820a9535608.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 5008 bytes
SHA-256: f64655a7dfb6ebe3017bff412192ae5468e057ecbdf50abb219c327c069abb73
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 10920 bytes
SHA-256: e025a95d3ae61c9fffc8d2eb87716ded23ddb2d169e503e916a80215e83c9e23
font_02_sfnt_off00012fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71