Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0cc27149135605…

MALICIOUS

PDF

71.7 KB Created: 2021-03-15 20:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65f8093939bdb3429ca91ea640697a41 SHA-1: 7ce8798770fa0b81973662b373092a4f70dc870e SHA-256: ed0cc27149135605b694d086a0c30d779c8e97d7eca473106a923c7ddb894105
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a 'link farm' heuristic, suggests an attempt to manipulate search engine results or redirect users to malicious sites. The embedded URLs, such as 'https://nipisod.ru/wix?keyword=algebra+nation+section+2+test+answers' and 'http://ginupedarokuxu.getenjoyment.net/gixizid.pdf', are key indicators of this activity.

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-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=algebra+nation+section+2+test+answers
    • http://ginupedarokuxu.getenjoyment.net/gixizid.pdf
    • https://cdn.sqhk.co/sawusuzi/xUjemUu/14072396802.pdf
    • https://cdn.sqhk.co/nobipajami/jhjjVkj/5s_daily_checklist_examples.pdf
    • http://gaxesujite.medianewsonline.com/how_do_you_get_a_29_hand_in_cribbage.pdf
    • http://figedizizexi.22web.org/how_to_build_a_deck_for_beginners.pdf
    • https://cdn.sqhk.co/renapudovi/V8dgjgi/pamasorosawasurisuvuvej.pdf
    • https://cdn.sqhk.co/teposodigar/dbiipFv/eve_echoes_mining_rigs.pdf
    • https://cdn.sqhk.co/rubutemoxe/NhjAxjc/best_laptops_right_now_2019.pdf
    • https://cdn.sqhk.co/rilowikapaz/ig6Dgfh/74461631503.pdf
    • https://cdn.sqhk.co/posiraki/MFcitij/bootstrap_4_basic_html_template.pdf
    • http://xokebidukefu.getenjoyment.net/gojano.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_176450a5723a4cd48974c884bd4e232a.pdf?index=true
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_f94e12a6962440f690a27f34a8db108b.pdf?index=true
    • http://jafimogapevov.rf.gd/52440273198.pdf
    • https://s3.amazonaws.com/vidadaviwal/sumamugusonejedogaw.pdf
    • http://josejutolaxof.rf.gd/86665340046.pdf
    • https://s3.amazonaws.com/bupijila/calculus_larson_6th_edition.pdf
    • https://s3.amazonaws.com/suxuzubojut/form_set_value_angular.pdf
    • http://ziwivazud.onlinewebshop.net/98550139116.pdf
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_54a5460116f44b85b03351da56e5f254.pdf?index=true
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_74dd2cded28e40e3b5c977988b8bd4cc.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_off0000d8ca.bin
363ff92c348c09a9f4ff420d0dd63f3099767af53666303e36e09bcbda74f0c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 5320 bytes
font_01_sfnt_off0000eb07.bin
f98c0c2b07787621829664ee6364d659d9a72c4f3465007576695f82f9f09c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 10716 bytes

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