Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0817b2651bd8ac…

MALICIOUS

PDF

76.2 KB Created: 2021-02-23 23:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: eb22572dde7fb7aa855771440688b0a3 SHA-1: bb3c224aa713f74920ef088655dacb118b0f98f9 SHA-256: 8c0817b2651bd8acc1aeda03fd82bc1fd3fb341970153a91086a110861aedf53
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document is designed to redirect users to malicious sites.

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
  • 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://seumenha.ru/wix?keyword=kindle+oasis+user+manual+pdf PDF link annotation
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/gerol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_6032310ff0ffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_5fe6c41454caf.pdfIn PDF document text
    • http://tadezutalowebe.22web.org/interview_assessment_form.pdfIn PDF document text
    • https://tonirifiw.weebly.com/uploads/1/3/4/4/134468227/1267998.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/fuzivalew.pdfIn PDF document text
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/terugifunaxug_vubabo_fadebujoju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5ff02181e2ed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_6014a2c7b5021.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465545/normal_6009a4b4a0982.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/zazelujeju/crash_team_racing_achievements_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/shankar_bhagwan_ke_wallpaper_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/fizewuwurulolazejig.pdfIn PDF document text
    • http://sugudilun.epizy.com/83494619058.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/afterwards_formal_synonym.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/53000815088.pdfIn PDF document text
    • http://liwubujuwu.epizy.com/66370769462.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/mebididimodixom.pdfIn PDF document text
    • http://sidegiri.epizy.com/sogap.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_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 5156 bytes
SHA-256: c5da93bdf6fb89b56fb9fe77113f6408e006bf2f88dee12f90db2eb77f97b42e
font_01_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 10604 bytes
SHA-256: 106125639eeb373cb907e2054af3cd0e4aaf4bfcb324e4ef3f511339e6f285ef

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