Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6a6e66dab1d667…

MALICIOUS

PDF

74.0 KB Created: 2021-04-13 07:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 042680786b7268e4fcd534e299573a91 SHA-1: 56de6caf3e2c835afdb0fd225cae69ae5ef56fe9 SHA-256: 7b6a6e66dab1d667372ac45929c9924ecd1d4a18a1416d6dc71f913b70c7d412
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The presence of a specific search term ('phonak+brio+2+hearing+aids') in one of the URLs indicates a targeted lure. ClamAV and ML classifiers confirm the malicious nature of the PDF, likely for phishing or distributing further malware.

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.
  • 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://xezojetit.ru/strik?utm_term=phonak+brio+2+hearing+aids PDF link annotation
    • https://cdn.sqhk.co/zonurubo/3hgiijf/59125914685.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/HgcihPJ/gimow.pdfIn PDF document text
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/554717911.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/virelozig-ditesof-xamulazijug-xogodonuvalo.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/3482515.pdfIn PDF document text
    • https://zotexujefu.weebly.com/uploads/1/3/4/3/134322023/76a9c8a350113ec.pdfIn PDF document text
    • http://yatvoyya.fun/jesus_at_the_center_lyrics_with_chordsprn9q.pdfIn PDF document text
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/52cb10899.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/mhdgejf/jenavixuxigud.pdfIn PDF document text
    • https://dolilugufup.weebly.com/uploads/1/3/0/7/130776220/b89b69.pdfIn PDF document text
    • http://jumbochecker.com/asidosis_metabolik_pada_gagal_ginjal23stm.pdfIn PDF document text
    • https://zeruxukekojumu.weebly.com/uploads/1/3/5/3/135345771/gefono.pdfIn PDF document text
    • https://tatosexu.weebly.com/uploads/1/3/0/9/130969313/6934147.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwilaj/nXzeGkk/teguk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_a60dd5788ba7459792f588fcce0924c5.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_771d97bf8b1f43fe8fd6ae6b9f2f5af0.pdf?index=trueIn PDF document text
    • https://abc5f1b3-ad37-4660-b048-d9bff2240d70.filesusr.com/ugd/a1fb68_158ea112fc1d4935af28d9fbaa0e5254.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezewu/lagu_camelia_malik_feat_rhoma_irama.pdfIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_53de7a84711746efb2df9bec4bf5bc4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejexe/bpops_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/21461795289.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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 5392 bytes
SHA-256: 03b0fa40416038c26b3c1460f78099412f17f58fb913dd01c993d13c7bc44a14
font_01_sfnt_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 10236 bytes
SHA-256: be7a99d8cf2d3bcb57d21d922fe4b490675da3faf3e95845b8ff0c633ff51301

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