Malicious PDF — malware analysis report

Static analysis result for SHA-256 0825eeafda191768…

MALICIOUS

PDF

72.9 KB Created: 2021-01-16 16:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a81fc3e7191520b471281b6989ef4c57 SHA-1: 96fc62d8083db8a3d343b839351a4096fad424ff SHA-256: 0825eeafda1917680c913dcfce70bc0fe4f2d4052fd7d65cb7232727623dc240
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The heuristic firings indicate the PDF is designed as a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffine.ru/wb?keyword=zombie%20catchers%20hack%20unlimited%20plutonium%20download In PDF document text
    • https://zujavezamuni.weebly.com/uploads/1/3/0/9/130969293/1025079.pdfIn PDF document text
    • https://jogivugu.weebly.com/uploads/1/3/2/7/132740949/kapolejab_bakasavozatazu.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/0ae745138.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/Hhjifii/primesearch_service_provider_corporation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384851/normal_5fc75a6153db0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f9fa6f1c46b2.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/hggjfvp/road_trippin_lyrics_dan_and_shay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5fe5df6e1bc00.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/gchfjjd/4_pics_1_word_level_1100_to_1200.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumula/SB9aEyP/final_fantasy_x-_2_hero_drink.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/gJ1Vja5/veterans_day_deals_2019_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5fca6e452f39f.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/pisedij/wedazumavowisabedoworuw.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_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 5568 bytes
SHA-256: caf672206579fadc1ab6903be1aa0e2438456d1a3306e1fbe19c0fdf95c8764b
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 10064 bytes
SHA-256: 35896b35108cae77b0e5a2f9b85738f3e09fc8684dd8aacd87ee5f3eefabf71d

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