Malicious PDF — malware analysis report

Static analysis result for SHA-256 619b0826cc5b96e8…

MALICIOUS

PDF

74.5 KB Created: 2021-03-04 18:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ac28114d90147d86ac1a1d8a5d83ba16 SHA-1: 08f3ba953d6e9f97944cd068970fa6b1bda8ffea SHA-256: 619b0826cc5b96e8dd4deeedc611b56e57a1b4e88f7f2868c12ae4893c00e83d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded external links, with the heuristic 'PDF_SEO_LINK_FARM' specifically identifying this behavior. One of the primary URLs, 'https://gimoguvi.ru/strik?utm_term=los+renglones+torcidos+de+dios+letra+mago+de+oz', appears to be a malicious domain, while others point to benign AWS S3 buckets. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create SEO spam or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=los+renglones+torcidos+de+dios+letra+mago+de+oz PDF link annotation
    • http://wodasewusinoda.22web.org/42927408399.pdfIn PDF document text
    • http://streamsweets.com/diarios_de_motocicleta_libro5eh2h.pdfIn PDF document text
    • http://zekinaperobivak.22web.org/61810979903.pdfIn PDF document text
    • http://newyearshop.site/661226015079hyqy.pdfIn PDF document text
    • http://edayafar.xyz/spirit_and_graceh25wg.pdfIn PDF document text
    • http://wisevajiliji.22web.org/26002565103.pdfIn PDF document text
    • http://khareedforosh.com/clt_full_form_in_education7hlhg.pdfIn PDF document text
    • http://1offpark.xyz/swanns_way_moncrieffhyw5v.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/bofake/lasovepibiruko.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/68248046628.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/72107729525.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_142cf848ed3341b39fca24b461dbc8a4.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_9d6fabbaac52437f871df92822797cdd.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_f196b11ee951475c829a8a80e2348a9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/kurajasejiduxebunufug.pdfIn PDF document text
    • http://pugunexipidil.rf.gd/10079737728.pdfIn PDF document text
    • http://tovegini.epizy.com/ruwijokamul.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_d85eb51da0bb425db67a06d53751e916.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/54080059532.pdfIn PDF document text
    • http://sijopar.epizy.com/xiruso.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/fallout_1_special_guide.pdfIn PDF document text
    • http://xifebudi.epizy.com/freeze_excel_worksheet_tab.pdfIn PDF document text
    • http://kigitom.epizy.com/59401729772.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/batewolopinuro.pdfIn PDF document text
    • http://xiwilamudebi.rf.gd/pezurowunedufapolufotam.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_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 5248 bytes
SHA-256: 84e885510b1170692e15768137816e5412653bfa5c9519e40894d6e934857373
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 11868 bytes
SHA-256: 58f0a188d6c8bd282980d7daab8f4c66063ae408c91ce6709521009356c5744e

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