Malicious PDF — malware analysis report

Static analysis result for SHA-256 900c38fd02b54b9e…

MALICIOUS

PDF

86.3 KB Created: 2021-02-14 22:31:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 392620cff346b439c76181c3ced96e1f SHA-1: 91fc65b38a0deb9f8067fa9343fce3e3fd17ba35 SHA-256: 900c38fd02b54b9eb2e50c38ccd674c2cc65d8f5fbbcdbba5dbcc68d7359e249
134 Risk Score

Malware Insights

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

The PDF contains multiple external links, some of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or link-farming attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/aws?utm_term=dplyr+cheat+sheet+espa%25C3%25B1ol PDF link annotation
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/9687784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455176/normal_60125d3e6edf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474450/normal_5feb1bb2e0f5f.pdfIn PDF document text
    • https://cdn.sqhk.co/vukobefebu/gBiiWhc/wuginenejapebu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480579/normal_5fc8d4b3d2f06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5fd15eb21e6fb.pdfIn PDF document text
    • https://jonurimexiv.weebly.com/uploads/1/3/4/3/134321783/7881069.pdfIn PDF document text
    • https://jodejivosarixu.weebly.com/uploads/1/3/4/3/134314211/fbd8548230.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/gyvWYN8/italian_dessert_recipes_easy_and_quick.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/nodejogilun.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/nuxepiduded/year_3_maths_word_problems_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/kadapunalagasozuze.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/dagurovuni.pdfIn PDF document text
    • http://legekiwogitevil.epizy.com/bowflex_xtl_manual_guide.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_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 5332 bytes
SHA-256: 7fe1f0df18c3085f3d9be233378aa621d2712cef7539acdc7b34365473c39656
font_01_sfnt_off00012316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 11924 bytes
SHA-256: 5f5f7034207636ec239c739c76767053264f15a3e16b74f51c1e9793039a2ba3

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