Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3833e10880f7fa3…

MALICIOUS

PDF

74.3 KB Created: 2021-02-24 05:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dc7de814164e35474db0b0ee0c322ce5 SHA-1: 299808c324db766485474a0e59557dccc7a3499e SHA-256: d3833e10880f7fa369c1754776052a6d9ed20b15d119298dd5f124a0841ba802
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URL 'https://baarspo.ru/wix?keyword=oceanhorn+apk+full' further supports the lure of providing potentially malicious software downloads.

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://baarspo.ru/wix?keyword=oceanhorn+apk+full PDF link annotation
    • http://ita-fitness.fun/57304427408kfzve.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/tihvRgf/luxafunimovibi.pdfIn PDF document text
    • https://ganalazukomej.weebly.com/uploads/1/3/4/7/134714395/8238141.pdfIn PDF document text
    • https://sujarusokebukok.weebly.com/uploads/1/3/1/4/131437349/gixugubizafoki.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/potovexisuni.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/2930139.pdfIn PDF document text
    • https://rujuzodojavumip.weebly.com/uploads/1/3/4/7/134726220/gisasajif.pdfIn PDF document text
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/fe5516b71cc7bda.pdfIn PDF document text
    • https://xulijuba.weebly.com/uploads/1/3/1/1/131164032/478d7bb7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472501/normal_6009680b17825.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_5ff325ce7b5ad.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/dpgjd9Y/nonopewewilo.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/egfhhUp/super_mario_kart_game_over.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/bthbhe2/xowola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_6024bf679829e.pdfIn PDF document text
    • https://sonoxezepokamev.weebly.com/uploads/1/3/3/9/133999938/5090555.pdfIn PDF document text
    • http://callup.today/laser_eye_color_change_costa_ricakldey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 5016 bytes
SHA-256: d4a0af5fa6362c80e4e1427f331f90d3f0eb625c8767db3d97c61d302a419e01
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 10240 bytes
SHA-256: 3440a4519552222ab9d8d4d1d24b832b5fd3e47b0f873e51d7af877419a3aad5

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