Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b64cb75db1c29ad…

MALICIOUS

PDF

72.8 KB Created: 2021-03-17 03:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a35ed210eb4daba7fb564b8d58db24df SHA-1: 24eb23fb81d6074d5246daba0e572c59328477d6 SHA-256: 7b64cb75db1c29adf247558e09cffc3ddb24a86232a4f6ba4ef033ce2ee91637
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, suggesting a link farm designed to redirect users. The primary malicious URL identified is https://jumiwimov.ru/strik, which is likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://jumiwimov.ru/strik?utm_term=how+to+fix+my+ge+microwave PDF link annotation
    • https://xaforexu.weebly.com/uploads/1/3/0/7/130775472/2171493.pdfIn PDF document text
    • http://testertumentum.space/dazasovolakomedotejowodit7d316.pdfIn PDF document text
    • https://jetesobamu.weebly.com/uploads/1/3/5/3/135323438/vofawa_tubabutu_dosasilibudirel.pdfIn PDF document text
    • http://fartook.online/126316459692ktab.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/appearance_and_personality_test.pdfIn PDF document text
    • https://vifelewumatorav.weebly.com/uploads/1/3/4/6/134669873/wubanilid.pdfIn PDF document text
    • https://vifozafep.weebly.com/uploads/1/3/1/4/131407061/vuzoni.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/dapasemimaxewesinas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_981d52f7b3734efeab941fd0e63c12dd.pdf?index=trueIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_c2d43ab979e74b149aad2b0d67df4aa7.pdf?index=trueIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_d52694558c684dfd995f5f5d57d1af1a.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_171f6fc7efb24b9dacabe94d14710027.pdf?index=trueIn PDF document text
    • http://visugog.myartsonline.com/fofoxapevuzisesasesu.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/65680260865.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/7672397291.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/not_hiring_letter_template.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_9f5cf17f5bb045029e87cdb658ccd99b.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_eaeaa12a37714787b82ff53670eeaed1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/koroxetodixuzojin.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_61154b5f378544b5b6939204297534b7.pdf?index=trueIn 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_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 4956 bytes
SHA-256: 1428d09e02aea7e20e909456a513741fe8ee433ed462c5036970ef6fbfd712c2
font_01_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10876 bytes
SHA-256: 69acf761d21d354a080c65a54592a623575b99392b75e67271e1bc1e7487674f
font_02_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e