Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8026b40de49f3a…

MALICIOUS

PDF

77.9 KB Created: 2021-03-29 07:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5932fd4831f99758c625917f4e77fc2b SHA-1: b11cc7ae02a889b8ea01e641654b5a39392c06f5 SHA-256: de8026b40de49f3a214223e94ca448f1b452547dbe8e4d8b5b1dbaf25c2103f2
164 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 as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://maypoin.ru/strik?utm_term=how+much+do+sleep+consultants+charge PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5feeaafb41d2c.pdfIn PDF document text
    • http://xizugef.medianewsonline.com/que_es_el_bullying_escolar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444351/normal_5fcd984dedf11.pdfIn PDF document text
    • http://dekovag.mypressonline.com/89952784284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476135/normal_60567806df0aa.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/nakevoja/guide_akali_s9_top.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/33367551673.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/56478373090.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_4f4aff8517db4988ad4a12a991cab8ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitok/12298959055.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/android_studio_3_barcode_scanner_example.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/corian_mandir_manufacturers_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/rivojefe.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/girl_with_the_dragon_tattoo_movie_swedish_version.pdfIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_135e2cd9ef5a4c2f8d084b570b9a79b2.pdf?index=trueIn PDF document text
    • http://lojibovel.myartsonline.com/what_are_the_components_of_a_functional_behavior_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/can_you_tow_with_a_rav4.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/95227934377.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_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 5540 bytes
SHA-256: ae1a8624a59d27e520f94ac2bde4641251ee1d87eb3573b5803434aa88e12d21
font_01_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 10780 bytes
SHA-256: 29f82773e0e13ad05ddacfe90381db9b51dcc51e5c191c029b62f78a8650c07d

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