Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbb0b595984bfc0…

MALICIOUS

PDF

84.5 KB Created: 2021-04-03 02:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 19a60c3266883a1f620f9e9d7c9a90ee SHA-1: 413b735939a03db41edac6c284f97a4667533215 SHA-256: 8cbb0b595984bfc06eabda0a61888dd94f294d26902f260b7244590ab0bfb890
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 services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/wix?keyword=de+donde+proviene+la+palabra+etica+y+que+significa PDF link annotation
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/9997640.pdfIn PDF document text
    • https://nakubinigana.weebly.com/uploads/1/3/1/3/131379761/renitiged-sewobamekibapo-dorasaniwugal.pdfIn PDF document text
    • https://nuzibekupin.weebly.com/uploads/1/3/4/3/134338080/7901704.pdfIn PDF document text
    • https://xudapunazegiwav.weebly.com/uploads/1/3/2/7/132741045/b9a3dba.pdfIn PDF document text
    • https://razavojukuraw.weebly.com/uploads/1/3/6/0/136090857/01c8abde4851.pdfIn PDF document text
    • https://gipazekafasulal.weebly.com/uploads/1/3/4/6/134600210/bb59d76.pdfIn PDF document text
    • https://kuzosilu.weebly.com/uploads/1/3/2/8/132815793/zukiramor.pdfIn PDF document text
    • https://junezafebu.weebly.com/uploads/1/3/0/8/130874287/tafigurilu.pdfIn PDF document text
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/7876197.pdfIn PDF document text
    • https://nofiluwovix.weebly.com/uploads/1/3/0/7/130739726/2d541f.pdfIn PDF document text
    • https://gajevorotaro.weebly.com/uploads/1/3/5/3/135329880/6701f7f6102.pdfIn PDF document text
    • https://xuvamifete.weebly.com/uploads/1/3/0/8/130874567/bozatifabe-dejedoxob.pdfIn PDF document text
    • https://wojebera.weebly.com/uploads/1/3/0/7/130775791/jarorizese-wikinajiku-pixoluwedumuf-sutujuvezobajuk.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/favegotasa_dasanoniva_pepurer.pdfIn PDF document text
    • https://garagagu.weebly.com/uploads/1/3/4/3/134364865/bagezepowogim-kujewifozolapid-jadizabij-sevuzib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6aa9c7-028f-4069-8db1-5a5fbed8f335/golden_son_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2127bea-70ea-44f2-b863-67d0db710b2a/see_you_ka_matlab_kya_hota_hai.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/25914931343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66910a40-651f-4cf4-9038-a565b8b5c460/6241617735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03888dc-ff51-4f67-aebb-a23dad93b9fc/canon_mp240_error_code_p2.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/apostrophe_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d3bc8ff-69f0-4aef-be53-8b85502ac048/how_to_measure_education_effectiveness.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/87651156250.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/sodapalazepuradejeb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 5748 bytes
SHA-256: aef43c38a778457163fcd162898ab870819db33d56bced051a56389eb39bf883
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 13876 bytes
SHA-256: 7b78695dfcdfc5e7a8383a7556a9a2fda4252ffc29c0310451317adefac997e1
font_02_sfnt_off00012f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1B 16200 bytes
SHA-256: 909e1284cb5cf330e420864cb10833f98e2764078d03bc4f2432c8e182b13f15

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