Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97e775130cbbc70…

MALICIOUS

PDF

79.7 KB Created: 2021-01-05 21:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1a23886ede1f53df0f0a854a7ee51c95 SHA-1: 8e4b98c265978187f6d621d05c427cbae3c2c16b SHA-256: b97e775130cbbc70f96d3f9dbf66d6b84bd03eb7ac8b3e0c925dc88ef315695a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing lures. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one prominent example being a link to a PDF hosted on AWS. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users.

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://trafffi.ru/aws?utm_term=game+black+hawk+down+android+offline PDF link annotation
    • https://cdn.sqhk.co/fujalapevame/Ihbjdje/human_heart_3d_model_free_download.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/834629.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/retisovojor/wordpress_report_abuse.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/wudimudotawun.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/words_that_begin_with_shoe.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/binazagejupifelu.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/zimumemebusiruxixil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6adda552-c6db-4e0b-8111-b5415c799d8e/chameleon_lizard_petsmart.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/59985413045.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/bruce_buffer_it_s_time_audio.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_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 5408 bytes
SHA-256: 79d6bd4d3e4991137dd0b830037a2a793c80e2accad73c6404a2a3a455248432
font_01_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 10700 bytes
SHA-256: 71a8eed14cb56ae8195b245edad31f664643bd80090ff1ae7b9a5610252bddb1

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