Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21dbeb1c83dc88c…

MALICIOUS

PDF

73.6 KB Created: 2021-03-17 10:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3f49b0831110a2ebbadbef9747aa4e2b SHA-1: bc25897f96d9b69f649ec20e251163584543f703 SHA-256: a21dbeb1c83dc88c0fbbee9ad24192d21c1be5e2caa570dc6d26f96c6c3ecf0b
186 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The primary malicious URL identified is https://midufefew.ru/wix?keyword=papa+a+toda+madre+capitulo+51+parte+2.

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://midufefew.ru/wix?keyword=papa+a+toda+madre+capitulo+51+parte+2 PDF link annotation
    • https://zejoraxiziras.weebly.com/uploads/1/3/5/3/135315695/ripudix-gisuxutefa-rewakitewit.pdfIn PDF document text
    • https://duxedakaba.weebly.com/uploads/1/3/4/8/134899299/naxupenuvizomawixila.pdfIn PDF document text
    • http://misefosoteb.iblogger.org/irobot_roomba_e5_5134_reviews.pdfIn PDF document text
    • https://muvuvudu.weebly.com/uploads/1/3/5/3/135351086/zofoteduri_gunuz_vefivuri.pdfIn PDF document text
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/rorexanak_wupojutasa_lemiwuxiguv.pdfIn PDF document text
    • https://mogiwojijefinan.weebly.com/uploads/1/3/4/9/134900510/xuvabape_vujopexitofe_rovosipef_juzavusifeguxi.pdfIn PDF document text
    • http://nopubejojawe.22web.org/96082287911.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_56bd3b9b25ad4f28be3bd31d07325df6.pdf?index=trueIn PDF document text
    • http://gevorewububew.epizy.com/game_basara_2_heroes_android.pdfIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_b705293705c747e1940d6b5ceb1d0142.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/fabonijojadita.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_c10c129b87f24814beeed4fc1594c51a.pdf?index=trueIn PDF document text
    • http://mopobarijokix.rf.gd/68265602257.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/20314337973.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_68730f26abc143f78ced2dc262c4bdde.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_bd0fc6e82b2b44308411a82d9fcaf2d1.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_8c7be8522a63405dbcdadf114de31fe8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/torixanisitonafaderudela.pdfIn PDF document text
    • http://zufomemibuji.rf.gd/tukoxikisolowebed.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/bedewalulotapugekafoju.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_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 5352 bytes
SHA-256: 5584567ddb31a7833cb58c57e48c70884473d520a5fabc8ce2a1ff79bf36865b
font_01_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 12888 bytes
SHA-256: e9ca46765bc606e2ca102d47034dad300e64f41076ca23f87f79c93335a688f7