Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f976cd249092565…

MALICIOUS

PDF

72.0 KB Created: 2021-03-13 17:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06d3ea7679480baadb9086a294162053 SHA-1: 3ba09cea8508d53806e3a0be8fbdd69d31f6cbf8 SHA-256: 7f976cd249092565b341d64e1b64596661a1de65ff4efed4d799c40cdc052c01
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, indicating it was likely generated programmatically.

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/123?utm_term=chinnamma+katha+naa+songs PDF link annotation
    • https://cdn.sqhk.co/mixaluwekitu/2uijjej/like_a_boss_meaning_in_arabic.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/ehhgfhj/movie_wallpapers_for_iphone_x_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464734/normal_5ff021c92394f.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/Ajchgha/xfinity_race_today_results.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476578/normal_5feb0eaf02e85.pdfIn PDF document text
    • http://paguwob.22web.org/98363092010.pdfIn PDF document text
    • http://mamewebifukuv.22web.org/campos_de_la_psicologia.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/haif4ge/brain_it_on_32_level_hint.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_603bd0d718a40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_d5e3d493da674d79813da96a27b85369.pdf?index=trueIn PDF document text
    • http://baxamudixilado.rf.gd/56055904817.pdfIn PDF document text
    • http://nodikisiti.rf.gd/neet_2019_answer_key_aakash_institute.pdfIn PDF document text
    • http://joluromimazatub.epizy.com/gofakojudopefukekun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483b16e2-7a49-4d03-bdb6-d424f8199bfa/10050235058.pdfIn PDF document text
    • http://pusejik.epizy.com/96729911591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/951f4fda-4e0d-4ef2-abcc-97e12cacc803/26703402691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748aa18b-1da6-42a5-8119-7b7291de5572/69163849867.pdfIn PDF document text
    • http://negugamavuvop.epizy.com/rusamegajaruxamatixo.pdfIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_24dc026f248745ad95cdc2250143a9a8.pdf?index=trueIn PDF document text
    • http://jimuxilobu.rf.gd/abelardo_y_eloisa.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_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 4940 bytes
SHA-256: d1a02c12196f7137166e823c5e099f06953846fcc11dd006effb4ab2c5a75f1f
font_01_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 11472 bytes
SHA-256: 5ef5740ab71645c2dea3e20d802dc75bb8f99c7fbb33f3c518ba4128e18fd693

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