Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3c85fd94f247af…

MALICIOUS

PDF

77.9 KB Created: 2021-03-21 09:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 93be2602c314985872624cf65885e542 SHA-1: d4918ffd1745b16441f2a02993c25d1cf268b112 SHA-256: 6d3c85fd94f247af554b849ac16c025d6dc046481be0a2c9e85bf101274cd09e
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an "enable content/editing" lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://jacksth.ru/wix?keyword=crystal+violet+lab+chegg PDF link annotation
    • http://se-mrush.com/dezesowum9lcyh.pdfIn PDF document text
    • http://discount50.pro/what_desserts_can_i_make_in_my_air_fryer1mxj4.pdfIn PDF document text
    • http://pobuzajabazuwu.iblogger.org/ziwabusubebikow.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/newagu.pdfIn PDF document text
    • http://kulokozataxat.22web.org/25079015660.pdfIn PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/doziso.pdfIn PDF document text
    • http://podcard2020.site/81620567283eu8lm.pdfIn PDF document text
    • http://simcars.ru/gefemulafep7jcb5.pdfIn PDF document text
    • http://monongzhlh.space/sogeseluri4958y.pdfIn PDF document text
    • http://notojubemeduxan.iblogger.org/48939572194.pdfIn PDF document text
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/7514344.pdfIn PDF document text
    • http://servempieza.site/acer_t232hlabmjjz_touchy98kx.pdfIn PDF document text
    • http://esagafow.fun/flow_3d_cast_user_manualvi2zv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_2be4b623db19427686b026503e6b825c.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_eb9f0e87fe79437ba37531feb108c5e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a5b9ac-382e-4baa-9340-9f8f482535fe/julius_caesar_shakespeare_play_quotes.pdfIn PDF document text
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_2be4bbfbdc534de8867e68695cd7941a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8dfda3-f676-46e5-ba50-d94d4bd33f45/39406213730.pdfIn PDF document text
    • http://pubitawiwinas.rf.gd/weather_app_free_for_android.pdfIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_7e0be2bf6f704ee99644ea540e9b9e54.pdf?index=trueIn 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_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 5268 bytes
SHA-256: 3e7d99ee4f8a773c6d88e8af8284849da619da0bc230329cb139a61ea8cb1a6e
font_01_sfnt_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 11108 bytes
SHA-256: 8a04d2adf5d9fce786c947b2b75df57655e11d51500bb8581deb2126cc085b33

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