Malicious PDF — malware analysis report

Static analysis result for SHA-256 902734dd8c40efc4…

MALICIOUS

PDF

73.3 KB Created: 2021-02-16 02:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: abda0ededa5dc77efc34724908c47a9e SHA-1: 73e2452bd9c25fa0d8fdd5487ee771c2612eec73 SHA-256: 902734dd8c40efc4cd93675f2a7734be95c3a263e4be7ee63efb9cf99c5fcdd1
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, contains text related to device connectivity issues, suggesting a lure to trick users into clicking the malicious link. The presence of numerous external URIs and link farm heuristics further supports a phishing or malicious redirection attack.

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://baarspo.ru/strik?utm_term=my+samsung+tab+won%2527t+connect+to+wifi PDF link annotation
    • https://cdn.sqhk.co/pininipata/3jeejb8/rogitazozekok.pdfIn PDF document text
    • http://sy0n.icu/gawerep02ds.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/tattooist_of_auschwitz9sy8z.pdfIn PDF document text
    • http://vibuluvizawo.66ghz.com/catalogue_formation_schneider_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dazibewibu/hhwJgdT/21670330804.pdfIn PDF document text
    • http://remontnatali.ru/stipulated_judgment_form_divorce_californiaojkpw.pdfIn PDF document text
    • http://worldhold.online/17224673119mafiq.pdfIn PDF document text
    • http://leree6.club/how_do_i_become_a_public_administrator4re4s.pdfIn PDF document text
    • http://uaportal.site/41864660679xc9gz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiwiduropewoxo.rf.gd/25224893411.pdfIn PDF document text
    • http://sudusolupuf.epizy.com/28125754354.pdfIn PDF document text
    • http://magoravir.epizy.com/barrier_method_of_family_planning.pdfIn PDF document text
    • http://garulolit.rf.gd/82363568690.pdfIn PDF document text
    • http://nixabofivi.epizy.com/42861208285.pdfIn PDF document text
    • http://bavipilebevim.epizy.com/gold_guidelines_for_treatment_of_copd_exacerbation.pdfIn PDF document text
    • http://sunemixawuvija.epizy.com/bypass_app_store_limit.pdfIn PDF document text
    • http://zorarizasodefa.epizy.com/k20_pro_android_10_registration.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_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 5448 bytes
SHA-256: 84d06126b42a4e39353accee6837f36573689faec088b5405862d898b6d4321a
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 10520 bytes
SHA-256: 4d4fe097fe2a1bdb21561a218dec2df86f97bf6b503345796d5274c4cde2f9d3

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