Malicious PDF — malware analysis report

Static analysis result for SHA-256 d997837d3d326000…

MALICIOUS

PDF

69.5 KB Created: 2021-02-17 03:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 350877a63a31a22d6dfcca62253a4252 SHA-1: 5f738ce720cf748b97fa59d3f24de5e9b2be6405 SHA-256: d997837d3d326000221df3317b8db9e20dc43da5515f43b4ef3bd15817eb8c6c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and the ML classification strongly indicate malicious intent.

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://jottigo.ru/123?utm_term=what+type+of+oil+does+a+2010+chrysler+town+and+country+use PDF link annotation
    • https://susudomi.weebly.com/uploads/1/3/5/3/135319884/8a2660f6c5136a.pdfIn PDF document text
    • https://fotelixufigowex.weebly.com/uploads/1/3/1/0/131071188/raxiderevusedad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500001/normal_5fe4ffb5abc9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477373/normal_6026f6f77ddba.pdfIn PDF document text
    • https://fijegude.weebly.com/uploads/1/3/4/8/134850985/nosilefulojofepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_602960a8b22a5.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/fapenupigu.pdfIn PDF document text
    • http://faxizila.iblogger.org/lugia_s_song_sheet_music_ocarina.pdfIn PDF document text
    • http://hackins.site/294541416310s4pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_5fc71cbe28bac.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/nowonovege/concrete_slab_design_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/pork_chop_and_asparagus_sheet_pan.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/reporting_mann_whitney_u_test_results_apa.pdfIn PDF document text
    • http://jelazub.rf.gd/44536567779.pdfIn PDF document text
    • http://nebegekiguwipaz.epizy.com/facebook_free_for_android_mobile_phone.pdfIn PDF document text
    • http://fetapewifug.epizy.com/59678582630.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_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 5776 bytes
SHA-256: b8e513c84d373341d5ea2cb25f28847eca06e9a2d240c81ed9d21679bba8c395
font_01_sfnt_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 10856 bytes
SHA-256: c2181417f49c5b138ea7e97a882bee2b2537b4c89c9916693e01336bb259cf8a

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