Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddd6e748a3584d6…

MALICIOUS

PDF

75.7 KB Created: 2021-05-18 11:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 994d6e5342e8c0c466d734206bfbef36 SHA-1: 212587792661fb9ab72ff54c1c6dcadfa26667e0 SHA-256: 8ddd6e748a3584d6c0023bdcda72a30763d72930605742fd23f0102963459303
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to link farms or potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and numerous URLs point towards a phishing or redirection attack.

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
  • 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://zajinet.ru/strik?utm_term=metodo+de+suma+y+resta+problemas+resueltos PDF link annotation
    • https://posodukur.weebly.com/uploads/1/3/4/3/134347560/mamibulizeb.pdfIn PDF document text
    • https://dawejiji.weebly.com/uploads/1/3/4/5/134505451/c667eed3a.pdfIn PDF document text
    • https://disuterobusubu.weebly.com/uploads/1/3/5/3/135305861/kunelevuso-jikep-dujogoxol.pdfIn PDF document text
    • http://fiwogozugoxiget.22web.org/rididaxaxadubovixafukiki.pdfIn PDF document text
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/e1f8e773bc.pdfIn PDF document text
    • http://veloxezidirexob.iblogger.org/campfire_songs_girl_guides.pdfIn PDF document text
    • http://sagipidezipe.22web.org/27062829844.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/7211371.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zazoruwokabaj.rf.gd/pozinezejijowobodag.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/kill_devil_hills_surf_report.pdfIn PDF document text
    • http://zifiroduvibo.rf.gd/naming_aromatic_hydrocarbons.pdfIn PDF document text
    • http://konezisuvalexer.epizy.com/ielts_writing_task_academic_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/dry_bones_are_rising_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/valkyrie_profile_2_undub.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/48477532966.pdfIn PDF document text
    • http://sabejuxasatij.rf.gd/adjectives_suffixes_and_prefixes.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/sql_server_for_xml_path_format.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/xekinalisubesizewoze.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/75479500737.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/16014462980.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_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 5352 bytes
SHA-256: e5e818ade85cd8b87cabb3efcd1e5e177cf35c7c542e1c2b18214ef38041a109
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 12168 bytes
SHA-256: 14dd93ecae18886f619ec71c5aec696e728cbe61b31bdd5ad1de574b446d5e57

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