Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf0df9d5c7e4045…

MALICIOUS

PDF

77.3 KB Created: 2021-03-24 00:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7979db154bd552d4382658bdc2d07ac4 SHA-1: 965fabba3a23cd4302dc4dd521bc6a7774f72a72 SHA-256: 9cf0df9d5c7e4045e8e279cb76a802dfa8c749fb224702ded232d1b60ffc9845
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm designed to improve search engine rankings. One prominent URL, 'https://nipisod.ru/wix?keyword=mx+player+pro+1.7+40+apk+download', suggests a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=mx+player+pro+1.7+40+apk+download
    • https://static.s123-cdn-static.com/uploads/4462374/normal_5fe33e2fe60f8.pdf
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fd09f71465fd.pdf
    • http://iclod.tech/378747368425obyi.pdf
    • http://znasila.ru/waturoniruhp2dm.pdf
    • https://sunanineriputa.weebly.com/uploads/1/3/2/7/132740954/jofivorafet.pdf
    • http://rulonoxoso.iblogger.org/zuloreramiv.pdf
    • http://goossyy.online/flower_template_black_and_whitehq6el.pdf
    • https://cdn-cms.f-static.net/uploads/4369916/normal_6034361835a6f.pdf
    • https://sefovajeve.weebly.com/uploads/1/3/0/7/130775607/wetobubajewemopuwaf.pdf
    • http://spain50off.info/bitcoin_wallet_sign_up_bonus_20203dh1z.pdf
    • http://loveworld.club/how_to_connect_my_fios_voice_remote_to_my_tvsmija.pdf
    • https://fanolukexepafo.weebly.com/uploads/1/3/0/9/130969893/gotorololepakab.pdf
    • https://kuvixirizu.weebly.com/uploads/1/3/0/7/130739951/xexalokij.pdf
    • https://cdn-cms.f-static.net/uploads/4370063/normal_6018394ca0351.pdf
    • http://songkfrk.site/how_to_determine_level_of_care_substance_abuse92yj5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_e1a294195df6464883cc403adf596469.pdf?index=true
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_cfd182d664e04430b2556fc50fa0e76e.pdf?index=true
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_e2f06eaf949d4e3b9415c76edb2b9044.pdf?index=true
    • http://dijuruxowasi.epizy.com/jipenijosujupozejef.pdf
    • https://543e2b4d-9699-46d2-9656-875e860b8e63.filesusr.com/ugd/fb32d0_3d9650c507964ff78a3cbd54ddc39015.pdf?index=true
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_dd5adf634c264cb9a837bc92e390d7ad.pdf?index=true
    • http://zirofasorajama.epizy.com/50121024639.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0dd.bin
511f12e345ec9346a0e02f61d3ea23738d081f2596cec0ee6dba433f01964a1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 5500 bytes
font_01_sfnt_off000103de.bin
4a01b8fd0660e968c84daf2b3afead53210092104a686e4c9823ca619fe75fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10384 bytes

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