Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1202da885a21297…

MALICIOUS

PDF

68.8 KB Created: 2021-02-13 08:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 78048cf15c047ee51988230ee79a8673 SHA-1: 5767fda0b9b92d488754ddc8e3d86d79f5f847c4 SHA-256: f1202da885a212978e466e3e985be3ac8702be3fc58dcf3ae533862d7ef9db13
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary redirector URL is https://crophysi.ru/wix?keyword=the+great+gatsby+figurative+language+chapter+1+worksheet+answers, which is likely used for phishing or malware distribution.

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/wix?keyword=the+great+gatsby+figurative+language+chapter+1+worksheet+answers In PDF document text
    • http://ryukzak.digital/14362174688rif1u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5fe9d39ec8a09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_5fd8155706431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_6024ad0849c0a.pdfIn PDF document text
    • https://zanudega.weebly.com/uploads/1/3/1/1/131164011/vevavog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463529/normal_600c0ad900485.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466386/normal_5fede5d625eb3.pdfIn PDF document text
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/9968083.pdfIn PDF document text
    • http://sukujugonada.22web.org/7474351968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tunawibiga.rf.gd/bloons_td_battles_5_free.pdfIn PDF document text
    • http://duguferebijojo.rf.gd/discussion_lab_report_biology.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB860 5736 bytes
SHA-256: 75ab59ebe3cba2343bc173225103ec650a9ba4986fdd644fc8665216957c3d1d
font_01_sfnt_off0000cc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0C 10756 bytes
SHA-256: 9073c3819fdfaddc341093949a26ed58a1756bf69d803b60b5e01a407f6e0414
font_02_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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