Malicious PDF — malware analysis report

Static analysis result for SHA-256 10db2546c3713437…

MALICIOUS

PDF

90.4 KB Created: 2021-03-03 01:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3cb9fff98099baf793bb9c109f526990 SHA-1: eb6b654ecbeddbb06b5e0a4477db441d829e9310 SHA-256: 10db2546c3713437df6079fae3b68bdd916e7e9f749e681b14f0bceda7b16894
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and contains a high number of external URIs, indicating a likely phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links point towards a malicious document, potentially used as a lure or to redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wb?keyword=ga-ma785gm-us2h%20boot%20from%20usb PDF link annotation
    • http://weraka.online/kafebakejetofodobunewolq6qzq.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/jevibuvaxebuvidusobiliz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411696/normal_5fddd84524695.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/9072713.pdfIn PDF document text
    • http://emmetrix.net/984897982814ynm8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450746/normal_603bf0be526b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_5fe63dfe684cd.pdfIn PDF document text
    • http://options.expert/lojerexpe0o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_600c407cf11d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_60240486227ab.pdfIn PDF document text
    • http://eurosett.net/characteristics_of_life_quiz_answer_keyrebrv.pdfIn PDF document text
    • http://life50it.pro/ejemplo_de_marketing_digital_en_una_empresaku4et.pdfIn PDF document text
    • http://dadivasim.sportsontheweb.net/42393042110.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/t_fal_deep_fryer_oil_filtration.pdfIn PDF document text
    • https://legorigerelok.weebly.com/uploads/1/3/6/0/136056749/furidubedadurila.pdfIn PDF document text
    • http://nesobaka9.xyz/photo_video_maker_online_mp3696zn.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/fizufapu/kolutoram.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/libro_de_calculo_diferencial_e_integral_conamat.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_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 5880 bytes
SHA-256: d73c847f7532ff127529bcb926f45c5a4a0678e17b391a4b1e8879a87a7e52b2
font_01_sfnt_off00013636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13636 11188 bytes
SHA-256: 3d23905e43b4710028b1e9e64c3aa36b8a679cc515f81ba8e2928f81ce1717aa

Open this report in the interactive analyzer, or submit your own file for analysis.