Malicious PDF — malware analysis report

Static analysis result for SHA-256 03141d66a7ae6879…

MALICIOUS

PDF

93.0 KB Created: 2021-04-28 20:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f7165a755ab6f91632a5cddf80d95a82 SHA-1: edff18f8d4b9d225890e3f54afd5fd0d2def9ab1 SHA-256: 03141d66a7ae6879916abbbbdefbe767438228a963055f3dfb8ccede0b3769ba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and embedded URIs suggest an attempt 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://fokemale.ru/strik?utm_term=how+long+do+reticulated+pythons+live PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387701/normal_604b578486af6.pdfIn PDF document text
    • http://urolog.xyz/best_exercise_music_free4i3xp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495040/normal_604932f3755a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372972/normal_5fe3844fe03ab.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/fonafobu-zakabafu-xadoxodajogawi-nimemivakepupi.pdfIn PDF document text
    • http://nubolutlion.xyz/wind_energy_pros_and_cons_science5qcel.pdfIn PDF document text
    • https://rafodazav.weebly.com/uploads/1/3/5/9/135963082/cfafdc4a1b4050.pdfIn PDF document text
    • http://tehnopolis.org/kung_fu_panda_legends_of_awesomeness_theme_tune2o32h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368971/normal_5ff10a3a34983.pdfIn PDF document text
    • http://1ux.site/26878424880jifud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_6030f8cdea8bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tunarijog.rf.gd/charcot_deformity_left_foot_icd_10.pdfIn PDF document text
    • http://wajalapivibobi.epizy.com/felitarafezitekesomuz.pdfIn PDF document text
    • http://gajivibuk.rf.gd/didonaguti.pdfIn PDF document text
    • http://sugajuze.epizy.com/99_names_of_allah_in_english_translation.pdfIn PDF document text
    • http://bupomejov.epizy.com/19599255887.pdfIn PDF document text
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_a7d8f2a0dc3e4aa3ae6c43b19be4248f.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_d12085b6df984f68b380a0260a5b51d2.pdf?index=trueIn 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_off00012b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B51 5552 bytes
SHA-256: 8b2d8429936e51b92695e24cae34b54dc88a23b22530cfc0bb919446d2cf822c
font_01_sfnt_off00013e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E45 12452 bytes
SHA-256: 38f77905c18840403f9ced133583b7aa4732e102ab17b48e1d1e50f4b6bde10a

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