Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac88c52d456f9ed…

MALICIOUS

PDF

70.4 KB Created: 2020-12-28 04:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4b6ae2ca684bdbd2d357811af92942fd SHA-1: e427411854b2fdbaa0d4990b265639c9d7b785fe SHA-256: 4ac88c52d456f9ed17a0f809cc1d49d4cc20960ee3409d63e11c236e25ec4c7d
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external links, including one pointing to a download page for 'knife hit mod apk unlocked', suggests a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates the PDF is part of a larger network of linked documents, likely for SEO manipulation or broader distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=download+knife+hit+mod+apk+unlocked PDF link annotation
    • https://jixinedoxe.weebly.com/uploads/1/3/1/3/131383771/7891581.pdfIn PDF document text
    • https://bimidupixujeg.weebly.com/uploads/1/3/4/3/134319160/xexewesesinujax-pevonijuwotu.pdfIn PDF document text
    • https://ralevenewuw.weebly.com/uploads/1/3/4/4/134464099/bimipupudubo.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/pubopelej/free_printable_birthday_card_invitation_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28bc4e9-6d37-4d83-8a39-f870404e65d4/56717655570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3162f7-147a-4db8-b7b4-ee27d3ebf75a/28874028398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c630e9-7508-41a7-95d5-45a10c8b9606/austin_kleon_show_your_work.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/bizilaratuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c155a093-a2fe-4770-bc82-f1e200713bcc/92519738052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ce17e9-f4f7-4b7a-91b5-6afbb0cd7727/difinas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee40e4e7-8658-4451-b0f5-5d4d17e637cf/jukasetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05440c1b-3a35-4929-a982-f9586d182935/origami_flower_ball_no_glue.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_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 5276 bytes
SHA-256: 3446c539dd25a709791c8b78436d638d7d744bc14d8619e194c6b95c6d4daf60
font_01_sfnt_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 10780 bytes
SHA-256: 8282a209a7155cd2bdb08cb32b50a14ca213591eef39174c81168739bb3bc35c

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