Malicious PDF — malware analysis report

Static analysis result for SHA-256 eabc88d983d38397…

MALICIOUS

PDF

75.2 KB Created: 2021-04-03 09:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ba3b3a25ce09c736ec21eee6c36f188a SHA-1: 97a07db36c8984a2b287dc0ce8a06e24cdebb4cf SHA-256: eabc88d983d383979c107878cfee70d4b55607a6b195c571c510b73b0ee63fab
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://zajinet.ru/award?keyword=cbse+class+11+english+literature+reader+book+pdf+download', are likely used to redirect users to malicious sites.

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://zajinet.ru/award?keyword=cbse+class+11+english+literature+reader+book+pdf+download PDF link annotation
    • https://memapuzubabevu.weebly.com/uploads/1/3/0/8/130813849/2613637.pdfIn PDF document text
    • http://nefritthebestthing.site/how_to_download_videos_from_youtube31lmb.pdfIn PDF document text
    • https://kenoduzuran.weebly.com/uploads/1/3/5/3/135350653/vukozabonafupagidaru.pdfIn PDF document text
    • http://vandify.com/pemunarozegawenajovyxze.pdfIn PDF document text
    • http://guitar.su/vepinexape6wy06.pdfIn PDF document text
    • http://kogiwonewaveg.iblogger.org/analisis_de_riesgo_de_trabajo.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/hUUNij4/35460511197.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/juwufasanozu-xufaf.pdfIn PDF document text
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/rememum.pdfIn PDF document text
    • http://mylic.ru/indian_standard_for_sheet_metal_thicknessr73z6.pdfIn PDF document text
    • http://dugules.iblogger.org/96683229821.pdfIn PDF document text
    • http://webpost.pro/beechcraft_b60_duke_performance_specs4rzkq.pdfIn PDF document text
    • http://tukameduk.22web.org/55289627276.pdfIn PDF document text
    • http://kefuxew.22web.org/kiboripodalejuku.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/92gepjj/should_i_play_with_my_cat_s_tail.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/jedaxopopuko/43574320319.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/filehippo_kaspersky_antivirus_free.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/80584495194.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_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 5668 bytes
SHA-256: a3913cfbd3f0f838543d83c4fb8137434d3da3d235277e5523bf16fc9dd79840
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 11036 bytes
SHA-256: 22f3aee566decd7554eb1d1ec2127934edbbf35f8361dbe08e86718cdfe0e372

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