Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2a5dcb22097b12…

MALICIOUS

PDF

95.4 KB Created: 2021-01-21 15:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7e8a9df01554c75e229256704aa61255 SHA-1: bfa307292f252676386f709ea6822800b2bc5049 SHA-256: 9e2a5dcb22097b127c05d0ef56e137bf6b076580835c37c25a3cd8287b34bc1a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs, with one specifically pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The presence of a link farm on disposable hosting further supports a malicious purpose, likely to redirect users to harmful content.

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://baarspo.ru/123?utm_term=how+to+annotate+a+poem+gcse PDF link annotation
    • https://site-1174752.mozfiles.com/files/1174752/tunnel_race_vr_racing_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_5fe91c0292cbd.pdfIn PDF document text
    • https://site-1180682.mozfiles.com/files/1180682/komarejepexubadinib.pdfIn PDF document text
    • http://fesigemujelepir.66ghz.com/63507070938.pdfIn PDF document text
    • https://site-1175252.mozfiles.com/files/1175252/wiczenia_gramatyczne_angielski_matura_rozszerzona.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483591/normal_600870a4b416d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_5fdb714a90377.pdfIn PDF document text
    • https://site-1178814.mozfiles.com/files/1178814/concrete_slab_design_calculations.pdfIn PDF document text
    • https://site-1166608.mozfiles.com/files/1166608/brc_full_form_in_gst.pdfIn PDF document text
    • https://site-1235942.mozfiles.com/files/1235942/tamil_font_alankaram_free.pdfIn PDF document text
    • https://site-1166616.mozfiles.com/files/1166616/singstar_wireless_microphones_teardown.pdfIn PDF document text
    • https://site-1167942.mozfiles.com/files/1167942/colors_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kopisigapub/buy_flannel_bed_sheets.pdfIn PDF document text
    • http://jolasesiv.epizy.com/types_of_agricultural_marketing_information_systems.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 4920 bytes
SHA-256: 4a4d910e4c0b2003812d60d66abc6826f16f608a9adffc1c1c3c3cda662cd26b
font_01_sfnt_off00013c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C84 11228 bytes
SHA-256: a09f005460ba1f3f68ec0f6be5f3fb9fabca6fd39a88afeaca7927391b426c35
font_02_sfnt_off00016289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16289 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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