Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8a49db53a5eadd…

MALICIOUS

PDF

72.1 KB Created: 2021-02-23 20:25:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1792f9f551b7ab82b65ccd8a93c5a69b SHA-1: 3d42c308540005d17854d8ea9fd320fe54f89ecf SHA-256: 0a8a49db53a5eadd8b55fe06bc354d9c74981928b2bbf78bb3f4e67e2633dea1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to popular movie releases, aiming to trick users into clicking malicious links. The presence of a malicious redirector and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=when+is+the+5th+wave+2+movie+coming+out In PDF document text
    • https://sizeduxaginota.weebly.com/uploads/1/3/2/7/132712537/3735078.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/wujedizuros.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fe5d6a69cbd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fea285a0fbca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_5fd6639ba0aec.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/641190.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/Ujaicjc/44587547733.pdfIn PDF document text
    • https://galinigogazefu.weebly.com/uploads/1/3/2/6/132695851/9a0b2e0.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/jghgjji/2229079160.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/jNieigD/legacy_golf_course_las_vegas_scorecard.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://derekage.epizy.com/3189318833.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/new_song_2019_bestwap_dj.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_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 5508 bytes
SHA-256: 78d982528fda836071b616e1f30c0538fc5a86168dceb0426aca46b35229f7fe
font_01_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 10708 bytes
SHA-256: e2ad21783a1cc65844e22dee518340da2c336d5af0740e5c67473044a4462bc2

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