Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe8c2f54e5a797e…

MALICIOUS

PDF

84.1 KB Created: 2021-05-12 14:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9e4645ac3f48297dcbe30207661fcd4b SHA-1: 4eccfb74eb4e4b898a9bd848c82c38d54f3d1402 SHA-256: cbe8c2f54e5a797e193e86e3e32059fc8ee4a5b2736c4af1a9b6dc67f9e0f3f8
252 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains or known redirectors, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware or lead users to phishing sites. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=best+university+for+international+law+in+europe In PDF document text
    • https://fatomomome.weebly.com/uploads/1/3/1/6/131606630/2e57c2f80b.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/2666714.pdfIn PDF document text
    • http://sfr-webmail.com/words_their_way_spelling_inventory_grading3fapk.pdfIn PDF document text
    • https://cdn.sqhk.co/kugugofawaz/Kqifigi/gevizomifunibelox.pdfIn PDF document text
    • https://revoninutilira.weebly.com/uploads/1/3/5/3/135338282/logotedu.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/dggZLlm/jibopexajadipixedipike.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxunafifu/iiRhfgc/61557241488.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelemusib/vhavghw/lenepamelosuduj.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://jigibomafife.weebly.com/uploads/1/3/0/7/130738667/c5a1ce7.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxezitowefi/shbidha/88310604264.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/gcyqm0b/the_jackbox_party_pack_2_achievements.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/pifukizoxopegolejag.pdfIn PDF document text
    • http://garantiya62.ru/what_did_george_say_before_he_killed_lennie9t1u8.pdfIn PDF document text
    • https://doboxupa.weebly.com/uploads/1/3/5/4/135401174/543459cad729.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/ighd0fX/classification_report_scikit_learn.pdfIn PDF document text
    • https://jigudubexafodi.weebly.com/uploads/1/3/0/7/130738940/zabixe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zukopeziwegufu.epizy.com/5695283288.pdfIn PDF document text
    • http://mugukogegib.epizy.com/vufisuvugazuwes.pdfIn PDF document text
    • http://ladinuronabo.epizy.com/75351611132.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_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 5196 bytes
SHA-256: d0ee8dfafe74f728483f97c4c94d4f065aa2396b6895c40bb15f7770fbced69c
font_01_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 12304 bytes
SHA-256: a1a96addbda3688cf3ecc23867f91bbd53958598c4eb3c92d7a8c3db3528246e