Malicious PDF — malware analysis report

Static analysis result for SHA-256 49997dc1dc99cfc4…

MALICIOUS

PDF

75.7 KB Created: 2021-02-28 20:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: bb2287d270e6a51da72a84877b78f2d6 SHA-1: ef636c6987f1d326188cba5e3eafb42e93c0af0f SHA-256: 49997dc1dc99cfc49d2847afdca68d78512207b585a67c1a945ca7e9a7d89140
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'fl studio mobile 3 free sample packs', likely a lure to entice users to click on the embedded links.

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://nipisod.ru/strik?utm_term=fl+studio+mobile+3+free+sample+packs PDF link annotation
    • https://cdn.sqhk.co/bozadukopufu/Ujft1Gg/the_farm_sassy_princess_fishing_rod.pdfIn PDF document text
    • https://cdn.sqhk.co/poxirowo/c4sghhe/maze_runner_4_the_kill_order_trailer.pdfIn PDF document text
    • http://idealica-official-it.website/tosotemok08szk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_5fd7046f8945d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488100/normal_5fcb5e63c9f18.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/1429568.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/bissell_proheat_instructions_manual.pdfIn PDF document text
    • http://ledimpress.biz/176572064907xzj9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_602ae2208d9d4.pdfIn PDF document text
    • https://topazezinin.weebly.com/uploads/1/3/0/9/130969714/6b1d011eb566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_602b33dd81892.pdfIn PDF document text
    • http://fringigejy.site/kedurifedozowurelap2ugl4.pdfIn PDF document text
    • http://getne.xyz/escuela_positivista_criminologia3ejuq.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/deJnZ6m/59388869221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/nipikivugigagufu.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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 5624 bytes
SHA-256: d3caf255d0c1f32e5342115bf4713a646153d6220738dcc9579d70b507fa2608
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10924 bytes
SHA-256: bb6c07f2889235d6f598131a730dcc3eacb9d16e65759af09061c179b91b5a11

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