Malicious PDF — malware analysis report

Static analysis result for SHA-256 771636642843881b…

MALICIOUS

PDF

86.2 KB Created: 2021-06-10 04:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4e4ad575ff3883b9de315e60abddd7cc SHA-1: cbb853504808946952c43e62080234158043413c SHA-256: 771636642843881bb14946cda6613769b23368f53db734d4cf230f3bea880147
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or known malicious redirectors. The heuristic firings indicate this PDF is part of a link farm designed to redirect users to malicious content, and ClamAV detected it as a phishing trojan. The embedded URLs are the primary mechanism for delivering the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=solubility+product+constant+lab+report In PDF document text
    • https://vogexuluvudo.weebly.com/uploads/1/3/2/6/132695782/dutijazezan.pdfIn PDF document text
    • https://magapevalapa.weebly.com/uploads/1/3/0/8/130874167/sadawifez.pdfIn PDF document text
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/5628326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375514/normal_5feb1ac61e351.pdfIn PDF document text
    • https://xeludopoveju.weebly.com/uploads/1/3/4/5/134528604/eb2f1f23ce222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_5fd0a087ca347.pdfIn PDF document text
    • https://ragojozuzaz.weebly.com/uploads/1/3/4/6/134668900/jedetebekuzo-jezit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_603aa16b33619.pdfIn PDF document text
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/41a03cee1.pdfIn PDF document text
    • https://fobinoxibenor.weebly.com/uploads/1/3/1/4/131437242/8114068.pdfIn PDF document text
    • https://rilejaxetikisoj.weebly.com/uploads/1/3/4/3/134391290/1301796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_6063d21f40194.pdfIn PDF document text
    • https://surutadalonuta.weebly.com/uploads/1/3/1/4/131455158/ruwokeseg.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/5480756.pdfIn PDF document text
    • https://nedilobimizedov.weebly.com/uploads/1/3/5/3/135346130/3117748.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://uploads.strikinglycdn.com/files/65feefb3-802e-4c4c-ac1c-772efc154525/20238760268.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/29376804130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e42865-1cd6-4ddf-8ca3-6d308b29a4bc/black_and_decker_500_amp_jump_starter_with_inflator.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/f/sevukijixofilutabifabeba.pdfIn PDF document text
    • http://finatin.pbworks.com/w/file/fetch/144501183/28103757932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/433152ef-6748-4618-9d9f-400a66217689/endothermic_vs_exothermic_lab_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e15bbe0-6b93-44a4-8904-f74a7302f4d3/litavunetoloragigo.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/f/intermediate_macroeconomics_multiple_choice_questions_and_answers.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144699795/patiguzonizi.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_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 5296 bytes
SHA-256: aa4a5ebfc3116f019cca6847ae1d893351603e23b17508d79750d823ee0cda37
font_01_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 11144 bytes
SHA-256: e9250ed31a45cb6e0e0871cc9df107b3488445e313dd3f67a3710c8eab9c63f4
font_02_sfnt_off00013b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B62 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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