Malicious PDF — malware analysis report

Static analysis result for SHA-256 4393e3a40e1aef25…

MALICIOUS

PDF

84.5 KB Created: 2021-03-24 06:36:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ff3aced14d5db8e0dfed2f8460a7a894 SHA-1: d24d787af0824f7262d070c62325fb89be197297 SHA-256: 4393e3a40e1aef25e016c7fa75eaf298741ecd33f3cf9d9ef77b147df9bde847
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dugedepap.ru/award?keyword=camino+de+santiago+maps+pdf PDF link annotation
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/siworatovo-buwenomubej-wumiget.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/j9MDmgg/racing_games_bike_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_603c2838b106d.pdfIn PDF document text
    • https://jetefodakulerur.weebly.com/uploads/1/3/1/4/131453332/b26585de8ca99.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/iimhgib/84377201815.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/wZjAhgq/94177217294.pdfIn PDF document text
    • http://alsamcctv.com/priston_tale_priestess_guideq7ere.pdfIn PDF document text
    • https://govewusig.weebly.com/uploads/1/3/0/9/130969429/puvakakobevola_fomub_zorotaroresi_gozokexokot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382430/normal_5fe23e9004bff.pdfIn PDF document text
    • http://chelobaka.space/dd_national_live_tv833c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_601f2795aedbd.pdfIn PDF document text
    • https://mesowusiwa.weebly.com/uploads/1/3/5/9/135975120/josavomozukakadekag.pdfIn PDF document text
    • http://game-pro.xyz/899817281098tapd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_601083bc8c8fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405674/normal_5ff8575c9d543.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/aorGaii/nazekefaguxi.pdfIn PDF document text
    • http://liolika-rsya.ru/gofuwupigemeboxisr56ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_6054e1f57fa08.pdfIn PDF document text
    • http://bathforlegs.xyz/92437170782s2m89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474722/normal_6002d98a060bc.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/rujimidujek/4893901147.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/cordless_phone_with_2.5_mm_headset_jack.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/lenurujamamivuwodotukusok.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 5140 bytes
SHA-256: 210bd0a4c403c5c76c845a717ea490a26fbe881dbe6cf83d84331e5c55c1ba7b
font_01_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 11016 bytes
SHA-256: 8a3099116aaa72fc33d9094f6382b3bfa7b2210585b96f69e726e984120bc9d9

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