Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5bcd3194d5e7b9…

MALICIOUS

PDF

72.4 KB Created: 2021-02-19 01:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bffedcc206f17a0637bc392c81035f77 SHA-1: 99a5dc6681867c52f7d95123d9f55d7ec0cece62 SHA-256: 0c5bcd3194d5e7b910933de43479b2117ec0a3f069880fd97fc619b71d94fcbc
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for redirecting to known malicious infrastructure. The embedded links, such as 'https://crophysi.ru/wix?keyword=research+methods+in+psychology+3rd+edition+pdf+morling', strongly suggest a phishing or malware distribution attempt. The presence of numerous links hosted on disposable domains further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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=research+methods+in+psychology+3rd+edition+pdf+morling In PDF document text
    • http://zofoxexizoviro.iblogger.org/15089596022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_602d6d77733e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_602ef5b91d202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_601ffd5c3f4fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464052/normal_5ffa88a050d19.pdfIn PDF document text
    • http://dawajilimomod.iblogger.org/do_reloading_primers_go_bad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5fdde00ff35c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_5fcf71be0919a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_600c1fd3d4139.pdfIn PDF document text
    • http://buxosuloxe.iblogger.org/rirufopajumujugax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonumelipo.rf.gd/paginas_para_colorear_mandalas_apk.pdfIn PDF document text
    • http://mibofive.epizy.com/15900265704.pdfIn PDF document text
    • http://sasaroguri.rf.gd/vibamitadesirujen.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/32533432395.pdfIn PDF document text
    • http://gagisejokunego.rf.gd/mata_ki_aarti_dj_song.pdfIn PDF document text
    • http://wofaketizezoja.epizy.com/53961052356.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/15699955165.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/tatoxorumawafego.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_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 5840 bytes
SHA-256: 28fa00ccc5a196a80fa288c8ca0a21c5d5e9ebf469e8a6c428fb81640035ed1f
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 10820 bytes
SHA-256: 36941f1f197c6f4db9b4376628bca0b2ad3ce976b338e6c98218c7d71a9e462c

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