Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce9b43de0edafb5…

MALICIOUS

PDF

77.6 KB Created: 2021-04-29 15:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebd2a989ae3cf186a01eeef60dc03bab SHA-1: d8d029802db99ba7e9c59ff3c9a55be7436d1312 SHA-256: 5ce9b43de0edafb582e2ab198f1f177377b4b01d32aa4fe69a530a8b9c3d624d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain 'resalured.ru'. The document body, though heavily obfuscated, suggests a lure related to movie cast information, likely to trick users into clicking the malicious link. The presence of many disposable hosting links further supports a phishing or malware distribution scheme.

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://resalured.ru/strik?utm_term=nicholas+sparks+the+choice+movie+cast
    • https://static.s123-cdn-static.com/uploads/4420939/normal_5fef1a703223d.pdf
    • https://zibozofos.weebly.com/uploads/1/3/4/8/134896422/zuzopigunaroxitak.pdf
    • http://lojuxaga.mywebcommunity.org/13453572765.pdf
    • http://vitofemegawe.getenjoyment.net/474549029.pdf
    • http://dilawiputonu.mypressonline.com/mozam.pdf
    • https://static.s123-cdn-static.com/uploads/4484814/normal_60031c0308c75.pdf
    • http://zumewidife.mygamesonline.org/nomuxajivanofoxubiravuje.pdf
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/c4f9fe61c5ff.pdf
    • http://zugapuvu.mywebcommunity.org/lenovo_y50-70_ram_specs.pdf
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5fe207953257d.pdf
    • https://kuvegegujumil.weebly.com/uploads/1/3/4/3/134367432/kumogipil_bunomifida_mirapikopilunu_doruvorivesum.pdf
    • https://cdn-cms.f-static.net/uploads/4454694/normal_600b67eaafb62.pdf
    • https://tofujifudaxibav.weebly.com/uploads/1/3/5/3/135326414/xikidulafevijoj_mepudewewez_bivabonimigazi_vegerexeraxifu.pdf
    • https://viserewisesu.weebly.com/uploads/1/3/4/8/134886384/3391173.pdf
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/gewelu-vimugoboma-gakebeb-luzumufazodat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wadoromutisagar.myartsonline.com/whistleblower_complaint_fox.pdf
    • http://wawutanow.epizy.com/96608546869.pdf
    • http://pixividazexew.epizy.com/62941128825.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f071.bin
8f46924728b1cbce47f1c193636e537288f159b72432804a0ba1baf1d4dec89b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 5268 bytes
font_01_sfnt_off0001023c.bin
148d69954169a02943934384677db22086c8545a2d632498b4779ac38870532e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 11468 bytes

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