Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fe27ce69e8bf95…

MALICIOUS

PDF

77.6 KB Created: 2021-02-13 11:35:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5250e1aa19746b115630ec44646261be SHA-1: 5851f87cd7e369172b05ce165d35482dbdf03b39 SHA-256: 38fe27ce69e8bf953011d3439cb55b6f0dc8750a2f6152aa3ec05ee4aa9f92b4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain ('baarspo.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further suggesting malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=vampire+the+masquerade+character+creation+sheet PDF link annotation
    • https://cdn.sqhk.co/pasezateda/bghjgix/zegotofowafogixeta.pdfIn PDF document text
    • http://salea.site/jetaji0fyum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450883/normal_5ff4481fadd20.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/V4ReK8e/58002954140.pdfIn PDF document text
    • http://padojuputiki.iblogger.org/rockwell_hardness_test_lab_report.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/egfThgm/napimewed.pdfIn PDF document text
    • http://navalny.design/kilofelimaluzifapimai3u3.pdfIn PDF document text
    • https://cdn.sqhk.co/judigirowe/ajcIhgQ/download_ace_commando_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/vozofugova/jfnO3ii/jio_prime_recharge_plans.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_60183b32325b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370089/normal_600032ac38332.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/lowebemuwojiso/80834314514.pdfIn PDF document text
    • http://gukupexokopiwug.epizy.com/lawogufo.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/fizexowugu.pdfIn PDF document text
    • http://kegonen.rf.gd/facebook_lite_google_play_store.pdfIn PDF document text
    • http://moxutomib.rf.gd/abdominal_distension_differential_diagnosis.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/environmental_data_analysis_methods_and_applications.pdfIn PDF document text
    • http://zazasos.rf.gd/26049571664.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_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 5372 bytes
SHA-256: 3c2334a532903391baf3807801c89029e092a503523ec528c3638b7afdd08fd5
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10432 bytes
SHA-256: 283aedd0d4eb75ada4a12cd8369bba70fc83537198b6c401c7a99e9db6b54268

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