Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7977e09bf47f40d…

MALICIOUS

PDF

83.1 KB Created: 2021-05-23 19:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 09b87b78105b7ef16724b0fe70ece642 SHA-1: 295e53c753be39827fa25d704c0fb31049f1f247 SHA-256: b7977e09bf47f40d70391918873c7c90fa06d6b2cdb3939bfc5d7cce120cee26
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting or redirectors, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=how+reverse+phone+lookup+for+free PDF link annotation
    • https://fiwozipuwawew.weebly.com/uploads/1/3/0/8/130814157/8635fa50cef868c.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/2a3ba5f95311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_602468f4cd8c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5ff55b331d67b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_601730076c935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_601a88bb924f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408718/normal_5ffb4164919dd.pdfIn PDF document text
    • https://rerutafedebe.weebly.com/uploads/1/3/2/8/132815298/wipepubimamolux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_605bb6aa9702b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_606a175d424de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446374/normal_6006a7dc6a893.pdfIn PDF document text
    • https://nunubawuguxage.weebly.com/uploads/1/3/7/5/137504951/be0f92962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493916/normal_6039227b00bab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_5fd22193c2f8e.pdfIn PDF document text
    • https://rutizinudepedo.weebly.com/uploads/1/3/4/4/134483735/f5265a489ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_606e3633cbec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506159/normal_606d6742b80d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5ffac8c62a817.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/xetasif/what_is_pre_harvesting_and_post_harvesting.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/balance_sheet_definition_and_example.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/lidenozuwinirakepexexixus.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/adolescence_medley_sub_indo_batch.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/canciones_cristianas_para_guitarra.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_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 4956 bytes
SHA-256: 94c7d5a21a31ee85a20aed60e508e3fa45ba1433c9960c633ff1013cda9a3f7b
font_01_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 11556 bytes
SHA-256: 3756874b477e99ac3738c5954b7af62f0c51556c61610fe4aaf3ac7f17c4aa15