Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafb44b9116ab4d8…

MALICIOUS

PDF

72.5 KB Created: 2021-02-28 09:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0f1374137acb15a3aaf6d8235ef2ee2e SHA-1: 60157303eaf0acbd4ae0610849d80c1e2390eb25 SHA-256: bafb44b9116ab4d846a7558cc923dd6d32b1476ea1359f9795ed7f6f32af4bca
164 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution scheme, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the presence of numerous external links. The primary URL, 'https://xajibur.ru/wix?keyword=chapter+15+the+chromosomal+basis+of+inheritance+worksheet+answers', suggests a lure based on search engine optimization. The ClamAV detection and ML classifier further support its malicious nature, pointing towards a phishing or trojan payload delivery.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/wix?keyword=chapter+15+the+chromosomal+basis+of+inheritance+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/gukokefa/gjXnN3b/91126633764.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/wepixuvuj.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/YUYf30Z/peletuzitinubove.pdfIn PDF document text
    • https://lubefapezixa.weebly.com/uploads/1/3/1/3/131398117/lajup.pdfIn PDF document text
    • http://ipatovaalena.ru/linux_shell_scripting_languagelodfr.pdfIn PDF document text
    • https://womagojewe.weebly.com/uploads/1/3/5/9/135961056/zenapoxofulubaten.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/aK2JgcB/99535805206.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/pexodugosa/apowersoft_video_converter_studio_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/48085644025.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/anjaana_anjaani_movie_480p_bolly4u.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/gosozagajukade.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/metutewubunoxodojirix.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/bhagavad_gita_story_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/49960604223.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/wallpaper_3d_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/wubavusirududuxafodoga.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_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 5632 bytes
SHA-256: a847a1bca8ee90f429117d1043eac8c166b6b06fadd6540b7cc99aed79370125
font_01_sfnt_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 10484 bytes
SHA-256: 8b67a3223f61401b9c1b1fec105720b44190b4c659f2a77de9fd2edc83101c11

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