Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c64c1b5e1e54dde…

MALICIOUS

PDF

81.8 KB Created: 2021-02-21 14:08:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9201de465043926a4d4fb8369dbf39b8 SHA-1: a32396d99db448a8d2fdecd4e06b3aadad5e6db1 SHA-256: 8c64c1b5e1e54ddef14569105396916ffd46373217dcc914ef4608f049e9187d
134 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains multiple embedded URLs, many of which point to disposable domains and are associated with link farms, suggesting a phishing or malware distribution scheme. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses time-sensitive language to prompt user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://druttle.ru/123?utm_term=what+does+the+shark+warranty+cover PDF link annotation
    • http://immorta-cross1.club/jasper_report_visual_studio_2017g28f3.pdfIn PDF document text
    • http://jolujunutido.iblogger.org/xabomakusunesebix.pdfIn PDF document text
    • http://komarovskii.xyz/65353507036tyytn.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/jiLAihv/12329082089.pdfIn PDF document text
    • http://4gusevshop.website/honda_eb5000_generator_repair_manualtg85u.pdfIn PDF document text
    • https://cdn.sqhk.co/duzemata/gdUhihi/revazaxenixomatesawod.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/haijjbc/sagepozasebinufe.pdfIn PDF document text
    • http://ewwe.space/tudidabubunukimuxapuwalozndis.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/cgehd4r/dokerutaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408172/normal_5fcb63e6e9570.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wuwedutukuw.epizy.com/post_parathyroidectomy_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/international_airman_s_information_manual.pdfIn PDF document text
    • http://litopuputorer.rf.gd/worksheets_on_tenses_for_grade_8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 5064 bytes
SHA-256: 00b2bb77f13cfae4b5e3383bbbd59674c0037ff09f5272fa4c9eac4baa72a3db
font_01_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 11044 bytes
SHA-256: ffec56c3130535a08b5a1999d829573e8ea84eb8499e2bb18398cafc13b46560
font_02_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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