Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8e963da88d1147…

MALICIOUS

PDF

76.1 KB Created: 2021-02-21 22:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8bcaa5bcf2a99ea6b26e3963deb3ae7a SHA-1: 2c26dca7d1b4534c3c86b81043272ea107d9b2e8 SHA-256: 5a8e963da88d1147f8dbac5f5f5d495651d49d181d312cb3ccd6fd963c56f210
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=sp+racing+f3+acro+osd In PDF document text
    • https://gozaperirij.weebly.com/uploads/1/3/1/1/131163841/lolasutizopetam.pdfIn PDF document text
    • http://nowanedilado.22web.org/app_store_connect_reports.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_601fb222b384f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421476/normal_601ae2625f3b4.pdfIn PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/fuveno_xozenirisok.pdfIn PDF document text
    • https://wofofubuw.weebly.com/uploads/1/3/2/7/132710679/xixuragijudal-rusufazom-toreg-movukit.pdfIn PDF document text
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/8309556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_60310095ba9f2.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/97d091f91.pdfIn PDF document text
    • https://temerineg.weebly.com/uploads/1/3/0/9/130969052/83697878.pdfIn PDF document text
    • https://degevibuv.weebly.com/uploads/1/3/5/3/135316410/5332825.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/kavalukato/asme_b16_34_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/11483137699.pdfIn PDF document text
    • http://zitosorav.rf.gd/84062400454.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/atatrk_s_reforms_education.pdfIn PDF document text
    • http://gixofevuti.rf.gd/yoshi_s_island_credits_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/89477127666.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/does_walmart_pharmacy_do_shingles_shots.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 5556 bytes
SHA-256: c094f285d675087153c7fbd0b749f8e1796d741f88e88e1652dbcc8471a0cf69
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 11976 bytes
SHA-256: ec92cbea6c3367a32e21a377859d3b42399f7c47b9423bd2e1de3a9252ab1c1f

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