Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbebd3ac48166040…

MALICIOUS

PDF

66.1 KB Created: 2021-01-31 02:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e49bd83abac56486f8d9bb224f938a2a SHA-1: 57d52b911b8011991acab59afa1b323873ba4531 SHA-256: dbebd3ac481660407f31aebf2c58d47337d7ca14cbdfa902f4975548ed2b2f21
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with the primary URL being 'https://seumenha.ru/123?utm_term=algebra+with+pizzazz+answer+key+page+229', suggesting a phishing or link-farming attack. The heuristic 'PDF_SEO_LINK_FARM' confirms the presence of numerous external links, likely intended to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://seumenha.ru/123?utm_term=algebra+with+pizzazz+answer+key+page+229 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5fdf18fa74182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413705/normal_5fe39a9b120f6.pdfIn PDF document text
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/vezusawuwosawapalobi.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/gipofurav.pdfIn PDF document text
    • https://waboralitenir.weebly.com/uploads/1/3/4/5/134504299/eef789e89ecc.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/mitajufafofa.pdfIn PDF document text
    • http://italywom.space/horror_monster_simulatorz4zcs.pdfIn PDF document text
    • https://matisosu.weebly.com/uploads/1/3/2/6/132681513/756b1216a8.pdfIn PDF document text
    • https://zogafopuniv.weebly.com/uploads/1/3/5/3/135390308/bufugoseladakojuju.pdfIn PDF document text
    • https://karinerojefemof.weebly.com/uploads/1/3/0/7/130775135/1dcf6873dc.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/divikufifir/40758368566.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/dekewazojasopi.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/sedivilefifupenifavowiri.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/assured_shorthold_tenancy_template_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/73855989450.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_off0000c646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC646 5808 bytes
SHA-256: b8ee8812555a85b2893f6eced566150c3227da459cacf7402872eda6c2647934
font_01_sfnt_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 9796 bytes
SHA-256: 705048f0d013517b4cedd3d409107b4b175d7429804a36452604777994d75a0a

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