Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23bf181286e4d93…

MALICIOUS

PDF

189.3 KB Created: 2021-01-11 09:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 382482d98c2847ad8df8ee4faf251fcc SHA-1: 92dfb03cbc3bb471ba423e46f477fb2eb8003781 SHA-256: c23bf181286e4d93316fca6ae2fe5def95b00e9c82199d1a90d9917cb3b86f96
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting services, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffset.ru/123?utm_term=critical+role+curious+beginnings+transcript PDF link annotation
    • https://site-1176333.mozfiles.com/files/1176333/ufc_253_date_and_time_south_africa.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/6570717.pdfIn PDF document text
    • https://site-1083673.mozfiles.com/files/1083673/tobejaxaputidiximuxameg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_5f9e322416132.pdfIn PDF document text
    • https://site-1168150.mozfiles.com/files/1168150/80204957286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366319/normal_5fca129426ea7.pdfIn PDF document text
    • https://site-1173288.mozfiles.com/files/1173288/90033849381.pdfIn PDF document text
    • https://site-1171825.mozfiles.com/files/1171825/mulipoligid.pdfIn PDF document text
    • https://site-1172169.mozfiles.com/files/1172169/homestar_runner_fisheye_lens.pdfIn PDF document text
    • https://site-1180194.mozfiles.com/files/1180194/rush_hour_2_lee_and_isabella.pdfIn PDF document text
    • https://site-1176005.mozfiles.com/files/1176005/mulevuvuxesa.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/6df62d1.pdfIn PDF document text
    • https://site-1176697.mozfiles.com/files/1176697/38532839406.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/61419452177.pdfIn PDF document text
    • https://site-1174138.mozfiles.com/files/1174138/37986905336.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/wenobagupexekap/popakep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002a306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A306 2960 bytes
SHA-256: d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796
font_01_sfnt_off0002ad88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD88 5144 bytes
SHA-256: eb591acc584214fca3475db0f7f4cb744a1d08dfccc08340ddf41cf1f40b18e8
font_02_sfnt_off0002bf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BF10 11692 bytes
SHA-256: 85512002f949ae11a4f44216006ebfd790ee21e692bb1e3dfeb6a7a3345d6fcf

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