Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5ee6690455ca3d…

MALICIOUS

PDF

73.5 KB Created: 2021-03-02 03:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ff948b7849e00bf28d85057dba526057 SHA-1: 52a0e11441395dc90f3f0213664420e2cc667e31 SHA-256: 0a5ee6690455ca3d026443ddefaf4721e53a6e1dcc97e981b4c34fc980a2bc59
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one prominent URL leading to a site that appears to be a phishing or malware distribution landing page. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute content widely. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://jottigo.ru/strik?utm_term=test+de+ingles+basico+gratis+online PDF link annotation
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/zipetomo.pdfIn PDF document text
    • https://tezosarotijup.weebly.com/uploads/1/3/4/3/134305137/talunudizofi.pdfIn PDF document text
    • https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/5783272.pdfIn PDF document text
    • https://powifamule.weebly.com/uploads/1/3/4/7/134757347/edbc2f628c.pdfIn PDF document text
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/padufaxowu.pdfIn PDF document text
    • https://vipamabukaxeban.weebly.com/uploads/1/3/0/8/130874648/falurapaxog.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/vonusirukete/math_basic_algebra_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/juvumelidasezokulimirega.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/curse_of_strahd_reddit_mandymod.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/wewubepabuxoburakexe.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/good_video_editing_apps_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/formation_ambulancier_croix_rouge_bordeaux.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/compare_australian_super_fund_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/annals_of_plastic_surgery_case_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/kotesozo.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/limop.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/zisuredenibo.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_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 5196 bytes
SHA-256: addd5a4b6714f9616f26513b0c89810212d9c120653918e348a2a20533dd0e24
font_01_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 10276 bytes
SHA-256: 8430a52ddf83f595bad20e0df1654eebdf737ba78d0f5577300eb454f347d7c1

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