Malicious PDF — malware analysis report

Static analysis result for SHA-256 db101cf1f74f38ef…

MALICIOUS

PDF

71.8 KB Created: 2020-12-05 20:21:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6844b437a7dab2138cd0564e1f02e06b SHA-1: 8bee4fe4d84dccf8797f73c0df348267d906fc52 SHA-256: db101cf1f74f38efdf624b1b66100da29922463ff6c89405d7573a03d2b84196
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a '2012 volkswagen jetta repair manual'. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The embedded links likely lead to phishing pages or malware downloads.

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 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.
  • 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://cctraff.ru/strik?utm_term=2012+volkswagen+jetta+repair+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4480579/normal_5fa7417a10dc1.pdfIn PDF document text
    • https://sawalodisixujig.weebly.com/uploads/1/3/4/4/134490012/wofenoxizus_vosefufur_jadam_bemumowaxapese.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/lumaso_gaxevona_zepuzarerosikag.pdfIn PDF document text
    • https://manukigobedor.weebly.com/uploads/1/3/4/4/134481395/b9adc3b6c8296b6.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/zofilekezizaniwura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389361/normal_5f8dde8c2a311.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/lanubili/17773433672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef29cd0f-e872-462c-b3cb-6891e6873735/como_es_la_vida_en_cuba_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/audit_firms_in_kenya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e980b490-63b5-4952-b768-e894a4fab1e5/10245840310.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/beatles_yesterday_guitar_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/81054074732.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfd3eef3361272aec423d/1606221120537/tc_helicon_voicelive_touch_2_manual_french.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/funny_toastmaster_table_topics_questions.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_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 5660 bytes
SHA-256: 43793de00c1331a3a43e091ae92a03df7e37c95ee290bab6458bfb5595dd355f
font_01_sfnt_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 10332 bytes
SHA-256: 885395a9f890b3a67690f812f3918f0bb3e09719f1ce63467c492c96c57f74be

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