Malicious PDF — malware analysis report

Static analysis result for SHA-256 4383aaadb95527e4…

MALICIOUS

PDF

83.1 KB Created: 2021-05-12 23:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 089f7532a68c731996af4a983c60fada SHA-1: c26395a0624bfa83a2f57e8000068315318a4154 SHA-256: 4383aaadb95527e4426b8d964a295b2b3ff7dcca6fe07e43ad10dd9b732907d5
214 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and a link farm. The embedded URLs, such as https://dafemum.ru/strik?utm_term=serta+motion+essentials+3+king, are likely used to redirect users to phishing or malware distribution sites. The presence of numerous links within the PDF suggests an attempt to manipulate search engine results or distribute malicious content through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=serta+motion+essentials+3+king In PDF document text
    • https://cdn.sqhk.co/nalawanuxa/aidV1hc/upper_right_abdominal_pain_and_ibs.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hegcSjh/fudares.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/fgchc8o/pagige.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/cRig8ph/zigoxobokedudoresuwawe.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/6374af7b6.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/gNhh21U/38894300717.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/que_es_el_gnosticismo.pdfIn PDF document text
    • https://cdn.sqhk.co/baxewoxevum/igcierG/zavazatogo.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/f4tjggj/stick_ball_game_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/deguxikezu/dhjgf2T/64373296593.pdfIn PDF document text
    • http://gumidaz.medianewsonline.com/baeyer_s_test.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/p9jjrje/digital_marketing_certificate_cornell_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/zaxuloxedu/lpsW2Lh/91976608940.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/b7thjrj/good_for_you_podcast_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/oGhejgT/bugamibelodomov.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/i0ibgcM/58968940717.pdfIn PDF document text
    • https://gazonigupeti.weebly.com/uploads/1/3/4/8/134879892/ratavut_nijulojixe_rovob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voxulija/jatoganifugunosijokuv.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/how_to_use_log_graph_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/38743679811.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 5336 bytes
SHA-256: 4e560b6c0e2bd4bc5e73d00a48b4d59fb37676712a4da58e42f3162d612f0f62
font_01_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 11552 bytes
SHA-256: 3b42f470208064e333d4f299eae87c4674bcd89b044ff7c4439d1d22d5b03494
font_02_sfnt_off00012878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553

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