Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad83371d15478ac…

MALICIOUS

PDF

72.9 KB Created: 2021-03-16 06:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d23317e22adf35cfdd36a746b0204d8 SHA-1: 9bea0642a9196cdd9d6b066713d2063a5939fb6e SHA-256: 9ad83371d15478ac9b6138b5939d60ab3a98340340fa9556a8c4eb142cb037f4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically pointing to a suspicious domain ('nipisod.ru') that is likely part of a link farm or SEO spam campaign. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojanized document. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=dna+structure+coloring+worksheet
    • http://roman-holidays.shop/star_trek_voyager_kes_and_neelixc3ych.pdf
    • https://waxosutuj.weebly.com/uploads/1/3/1/4/131437699/naseg.pdf
    • https://cdn-cms.f-static.net/uploads/4412575/normal_602e27b5b3d13.pdf
    • http://ewwe.space/baseus_encok_w01_user_manualiepd6.pdf
    • http://helpcreditscore.info/zogetetelivujemovem64kb0.pdf
    • https://pupuwovojetisig.weebly.com/uploads/1/3/1/4/131438468/4175908.pdf
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/suvat.pdf
    • https://bewokeramubi.weebly.com/uploads/1/3/1/6/131636949/fc3848e76.pdf
    • http://erogan-encolumbia.site/cello_solo_sheet_music_intermediate5vh9b.pdf
    • http://itayoga.space/dometic_13500_ac_manualignfd.pdf
    • http://sibuvre.com/90266379076bx9v5.pdf
    • http://migerov.xyz/523439096993r5jg.pdf
    • https://rapusixub.weebly.com/uploads/1/3/4/6/134631860/1de14d30b.pdf
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5fd851feac5ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_29f16a176d0d40b89ff610ed6433daf9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/11d9e7f8-91f6-49f8-a653-89dc90387226/football_playbook_app.pdf
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_959b42dc1ac647b5870696c29d1867b0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/807841b9-5beb-466a-9924-81e22bf958eb/gatemumidi.pdf
    • https://uploads.strikinglycdn.com/files/a63e1df7-4a04-448c-9881-f4b88634ba50/2012_jeep_grand_cherokee_overland_hid_headlight_bulb.pdf
    • https://uploads.strikinglycdn.com/files/3eef4847-a3ae-4da3-aa3e-6cae08ead9e2/pezin.pdf
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_a1c430d101e8425fb66ddb6868720cf5.pdf?index=true
    • 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_off0000e007.bin
d7a738d811f918bdfefb4575aa334e33f3b340918cddb395906992a42eeac83c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 5216 bytes
font_01_sfnt_off0000f1d9.bin
de69d34bf86bfff5e5e7052c165764c08aa9a0b46fee5271e55a33f45e580f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 10752 bytes

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