Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fe17c41f8778b8…

MALICIOUS

PDF

75.4 KB Created: 2021-01-10 08:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8e498824fa763bfe0d5def0aad4d498b SHA-1: a11debfc6426a834593b1825f2d5bee543f66b85 SHA-256: 35fe17c41f8778b891b926febeba880154a7275db5721a388f33db13a6480481
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and point to redirector infrastructure. The primary link, 'https://ggtraff.ru/aws?utm_term=inorganic+chemistry+quiz+questions+and+answers+pdf', suggests a lure related to educational content to mask malicious activity. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=inorganic+chemistry+quiz+questions+and+answers+pdf In PDF document text
    • https://rexaririwe.weebly.com/uploads/1/3/1/6/131637114/tudewovujutafusiwu.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/fetovobez.pdfIn PDF document text
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/lisuza.pdfIn PDF document text
    • https://dijatetobof.weebly.com/uploads/1/3/4/3/134322453/1dd3cec4ce0.pdfIn PDF document text
    • https://sazigusejif.weebly.com/uploads/1/3/4/7/134771803/mifumanof_jijevaf_kegovax_jewinigan.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/665fe6a3.pdfIn PDF document text
    • https://site-1171757.mozfiles.com/files/1171757/rigefunubavamek.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/fd098.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/hbDhghj/vedopew.pdfIn PDF document text
    • https://vefapabawi.weebly.com/uploads/1/3/0/7/130740427/5153330.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/4328044.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/djchb26/withings_bpm_connect_vs_omron_evolv.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/baxegezivumi/nijapapumaboxozonijelan.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/4290382988.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_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 5844 bytes
SHA-256: 09a88d066fe17c660b93aeec0a7ab6113e12e22259fa91c0c26d075b5b799981
font_01_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 10628 bytes
SHA-256: 9346d0769215280d51444de4e067aaa7df732e6c66d8acb6b0f2840054fb0d74

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