Malicious PDF — malware analysis report

Static analysis result for SHA-256 4591b788d8a29dc8…

MALICIOUS

PDF

139.9 KB Created: 2021-05-13 22:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1798f1254f55d2da463c5cebd179b8d6 SHA-1: 2f5bb40f547cb0a8fb845341be02dfbbbe051319 SHA-256: 4591b788d8a29dc88507d861a507f95d348776cdb6119acc3315efe66bb8240d
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, indicates a lure related to a "return of the king" theme, likely a pretext for an advance-fee scam or phishing attempt. The presence of embedded URLs and the link farm structure strongly suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://vilenefex.ru/strik?utm_term=return+of+the+king+extended+cut+runtime PDF link annotation
    • http://hookup154.online/spray_color_filler_for_hairpme1a.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/ighiihe/rizamel.pdfIn PDF document text
    • http://qupieasy.online/menolumevutedefime7t66k.pdfIn PDF document text
    • http://biweekamnf.com/83375475132oadrr.pdfIn PDF document text
    • http://gatorama.fun/beximesibuderorogusokogq0z1f.pdfIn PDF document text
    • https://cdn.sqhk.co/votijavos/dy7IkRm/powozifedujesojafidise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1efa8086-ba8b-46d3-b2fd-a4112e4d6e08/tewegisogerexikab.pdfIn PDF document text
    • http://duluxosi.epizy.com/machine_learning_from_theory_to_algorithms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429ce7ca-7041-4c9b-8905-04761b2b7fd0/line_6_pod_xt_pro_manuale_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9966fb35-b5f0-49bf-8029-2c0e46b28d45/lilexumepomubiro.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_a5ea76f442ec4377b378a064327db042.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f887af7-324e-4558-a136-44f9ebebeade/future_baby_girl_names_2020_unique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c3d4cd-1fb4-433b-8c6e-ca669a0c040b/apj_abdul_kalam_biography_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9919ea3-41f9-462c-bf72-36fd0c24746a/behringer_pmp2000d_manual.pdfIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_ce325767736d4622bfb148a76d37772b.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_958ce72232e64b44a638288a721abd7d.pdf?index=trueIn PDF document text
    • http://xoxadexol.rf.gd/malden_mills_split_king_polar_fleece_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed2b5d0-81d4-44c2-ba88-4f51e5d4c47a/mejisu.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_off0001d23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D23F 5152 bytes
SHA-256: c44110202ca1eed3c5914101dc39a58f2b575117cf9d8080ea5ecf496c057821
font_01_sfnt_off0001e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3AC 12288 bytes
SHA-256: 28555a6bc07048b2cc25cc8d3a26317a6c132f46f4e3c9e1aa9d4b43d4728314
font_02_sfnt_off00020c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C4B 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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