Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6f0ab87b11a099…

MALICIOUS

PDF

176.2 KB Created: 2021-04-27 14:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 12ded65b6b7bc6682d2536ccb9c41147 SHA-1: 27f17357530216d259b6f81b67aa57f51b8e6166 SHA-256: 8d6f0ab87b11a0994b284dc51f8c68c2a8d4588d9b459ea371e96a7d777106b2
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Dell optiplex 9020 drivers windows xp', indicating a lure to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://bologen.ru/strik?utm_term=dell+optiplex+9020+drivers+windows+xp PDF link annotation
    • http://jewidexomemivib.iblogger.org/school_vocabulary_worksheets.pdfIn PDF document text
    • https://dikodaselafilug.weebly.com/uploads/1/3/4/1/134108642/tijodabusodijikimibo.pdfIn PDF document text
    • https://dilozerekake.weebly.com/uploads/1/3/1/4/131452754/1003421.pdfIn PDF document text
    • https://monaxakapivelor.weebly.com/uploads/1/3/1/1/131164425/f4dbd945560ad.pdfIn PDF document text
    • https://bifomika.weebly.com/uploads/1/3/1/8/131856700/pofimiba.pdfIn PDF document text
    • http://gusitolife.iblogger.org/10932055999.pdfIn PDF document text
    • https://litusavetedi.weebly.com/uploads/1/3/4/4/134445261/8113946.pdfIn PDF document text
    • https://legipulevigo.weebly.com/uploads/1/3/2/6/132695741/70e1b.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/difidukawogerus_wedisupulo.pdfIn PDF document text
    • http://nisobetumiminiz.iblogger.org/71639066706.pdfIn PDF document text
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/fowobinuk-molaxafiwikelop-fefozelarufuse.pdfIn PDF document text
    • https://xokefinodoju.weebly.com/uploads/1/3/5/3/135316617/7423df4a6d4cf.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/figugipopar/kewekuveteb.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/duke_basketball_report_message_board.pdfIn PDF document text
    • http://wuxininozikup.rf.gd/2813038392.pdfIn PDF document text
    • http://weferobiditikun.epizy.com/what_happened_in_the_original_little_mermaid_story.pdfIn PDF document text
    • http://vaguxupinirulop.epizy.com/9165152252.pdfIn PDF document text
    • http://tizerusop.rf.gd/english_grammar_spelling_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/rejetojimexune.pdfIn PDF document text
    • http://lopusenegi.epizy.com/sisuxopenabad.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/wekimuzod.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_off00027a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A1A 5392 bytes
SHA-256: 2be76e3dacb5795f5ecb88f7c0666c65d715dec65b3ff386ad2a74c1262e9074
font_01_sfnt_off00028ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28CA3 10792 bytes
SHA-256: 9296ab3620f175a810d0b21cb0ff475c9d1ab50afb88f9cc98e28cec2b676741

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