Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8331950bac6977c…

MALICIOUS

PDF

93.7 KB Created: 2021-03-07 07:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b944d34556d4972a6cd4f4479e75e681 SHA-1: 3baec4cb338f57251658b2fb5bc220517f5c7031 SHA-256: b8331950bac6977c09c4fc98cedb03caffc837402424c8e1a8d650824950fcfc
156 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. 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 0.9995

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://xezojetit.ru/123?utm_term=bob%2527s+burgers+recipe+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485818/normal_6037e32a74b3e.pdfIn PDF document text
    • https://vufujisuwe.weebly.com/uploads/1/3/1/4/131437295/7332366.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/the_holy_quran_transliteration_in_roman_script_with_arabic_text_and_english_translation.pdfIn PDF document text
    • https://jaluburevajag.weebly.com/uploads/1/3/0/8/130874017/8041006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_600bf3c7c4e94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_602f778a48f94.pdfIn PDF document text
    • http://temilops.xyz/nuvuzulijaxulolerybm3s.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/88349608879.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/92921778792.pdfIn PDF document text
    • http://buylettersonline.com/43113395265baqfl.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/diraboluviwit.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/6484036.pdfIn PDF document text
    • http://ens-pictures.ru/nakinirisebizibx4s01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/dulumimejuzedalogobuj.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/66320075195.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/cad_viewer_app_for_android.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/pezenasimifadet.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/pediatric_neuroblastoma_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/losezogefisitorede.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/latipusifexikatudubi.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/52351531188.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/logical_abstract_reasoning_test_with_answers.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_off000124c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 5064 bytes
SHA-256: cc9908c989a82b29a5b4106c4e4d2a9b8816404adcce28cc7dc4c752c5db88e9
font_01_sfnt_off00013610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13610 11144 bytes
SHA-256: db0682ab812883c0f87e2170a5a7b4c3d6d3e4f4b18d83c359e8a1ea06c35eaa
font_02_sfnt_off00015b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B39 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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