Malicious PDF — malware analysis report

Static analysis result for SHA-256 622abedf0777b7dc…

MALICIOUS

PDF

84.5 KB Created: 2021-05-22 03:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 720e8b8b119e8067fe0c043db8a568dd SHA-1: 990baec8ba146448ea87fd548b3c212d26e20e77 SHA-256: 622abedf0777b7dccbaaac2bc732950c0912b6266c428bf5bba77c02f02b112b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary URL, 'https://xajibur.ru/strik?utm_term=stalwart+electronic+safe+reset', suggests a phishing or spamming attempt related to electronic safes. The presence of ClamAV and ML heuristic firings, along with the high risk score, strongly indicates malicious intent, likely for SEO spam or phishing.

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://xajibur.ru/strik?utm_term=stalwart+electronic+safe+reset PDF link annotation
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/lowakebuje.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/zekedemedewu.pdfIn PDF document text
    • https://zikawudewodag.weebly.com/uploads/1/3/4/5/134585044/ffb912.pdfIn PDF document text
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/mexatifitatebibanefa.pdfIn PDF document text
    • https://ludubilataso.weebly.com/uploads/1/3/4/7/134719947/lofifi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a22572d-6296-499b-9ebe-ca2893bb6fc1/84270873415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e185cfb8-00d1-42f3-8e48-2dbd22efa785/xisazamenof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84773db1-62fe-41e2-b85f-f1e3bc88a7a5/kagudomumakidezodozetitoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb30c8b-7fc5-4114-ba29-559dbc952e7d/directv_music_video_channel_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25552970-4f4c-4885-a141-e9149def3d96/were_going_on_a_bear_hunt_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fff36aa-0dd3-4c59-9cfb-a844ac9d8b89/biblia_catolica_para_jovenes_bilingue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b660a84-0b9b-43b5-b16d-a27eb8f663ef/consejo_escolar_de_participacion_social_hidalgo_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da22e9e-e10f-4ee8-84c5-96a11aebd897/19464945035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83dc77e8-b00a-4a4e-a593-d746e47c76f5/word_vba_selection.range.start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f7f18a6-afec-401b-8595-73d613e9b69c/75048822758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b5c461-5b54-4aa3-9e53-4261deb73d93/division_de_fracciones_con_diferente_denominador_ejemplos_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0ba176-2591-43f7-96da-0551a4d70f40/automated_trading_software_developer.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_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 5068 bytes
SHA-256: 36b56b10fc17869c3d11e838b6fd215fbba40564c5bb6a1e236de68a6509e8b4
font_01_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 11444 bytes
SHA-256: f9fededcf048faf25471fe57c726f82b6d6b668bf8693bcd19c3d98c231354ba

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