Malicious PDF — malware analysis report

Static analysis result for SHA-256 139fdd4305a13642…

MALICIOUS

PDF

71.8 KB Created: 2021-02-10 07:29:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c2f8af643f3ba3d323b38615889dd616 SHA-1: cf7cea4d018cf9168ee8b6dd0bc54e431bcc70bd SHA-256: 139fdd4305a136420b977b864748218075ad4806cbdf7cbfbf5857ace8c0d651
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The embedded links, such as https://yafferge.ru/123 and http://meetsoda.club/78712816450o4xjo.pdf, point to known malicious redirectors and disposable hosting, suggesting the primary goal is to redirect users to harmful content. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads.

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 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.
  • 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://yafferge.ru/123?utm_term=vocabulary+power+plus+level+10+answer+key+lesson+2 In PDF document text
    • http://meetsoda.club/78712816450o4xjo.pdfIn PDF document text
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/75bee9edc4ff.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/cecje9U/yellowstone_cast_lloyd_age.pdfIn PDF document text
    • http://normal-id.com/74044567521g051w.pdfIn PDF document text
    • https://cdn.sqhk.co/zubixola/cYgghi5/11079698682.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422643/normal_5fced9319ccbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5ff65015e36c1.pdfIn PDF document text
    • http://firstdoctor.xyz/budurimo19f51.pdfIn PDF document text
    • http://jobware.pro/zowunopizipegawozum75ov.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/N0a9hao/snake_coloring_pages_realistic.pdfIn PDF document text
    • http://hookup755.fun/aptransco_ae_notification_20201shjo.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/hcxlIgj/wowebekidopebusunivunepa.pdfIn PDF document text
    • https://xixirebuwujesi.weebly.com/uploads/1/3/5/9/135989839/nakebikofasogi_worif_tojedeka_fivapiramobalax.pdfIn PDF document text
    • http://reactivaperu-2020.com/suxutirir1ycqj.pdfIn PDF document text
    • https://mikezibe.weebly.com/uploads/1/3/1/4/131453119/a89576d9d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454163/normal_5fe38d607156f.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/bikatun-ropovevoreki-reborewosixu.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/pomaxa/63379760565.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/sujunovobiwexizezife.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/neridexojimefunavuvivela.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/angularjs_free_dashboard_template.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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 5676 bytes
SHA-256: 6d130953427fc3ce938612024f6aa216f6b15de8504d280111f22d760980a466
font_01_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 11204 bytes
SHA-256: ad68218578df1bb0a5e08e0ff685f9a3d069134ec6d7846de9b46fdb09c183d5