Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32ea737abef666b…

MALICIOUS

PDF

73.5 KB Created: 2021-03-12 03:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4a2a6e73d2ae431528a55f2537a877dd SHA-1: 21f73521464866cdce45a51b0dd7439f8736ae73 SHA-256: d32ea737abef666b38ad4a6c0ed49edb072e9de62ba940e2b69369924bec9fd9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links intended to manipulate search engine results or direct users to malicious sites. One prominent URL, 'https://gimoguvi.ru/award?keyword=samsung+air+conditioner+catalogue+2020+pdf', is presented as a catalogue, a common lure for phishing or malware delivery. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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/award?keyword=samsung+air+conditioner+catalogue+2020+pdf PDF link annotation
    • http://santand-es.com/nazomezabemutufagqt318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485579/normal_602e27c09cc76.pdfIn PDF document text
    • http://evatopshop.xyz/xuvapurssk4s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450889/normal_5febe533efb7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_6042f6d1b5dd7.pdfIn PDF document text
    • http://blaugrana.ru/setalimibewubejazeq1om.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_604834119146f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459322/normal_5fdea605f2e09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_5fd7d00044d56.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/kelukakeb/addition_and_subtraction_worksheets_year_2.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/football_manager_2017_trainer.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/nojojewalanav.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_ffafb2ab60a94eb0905b950d83226c5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/python_for_loop_continue_if_error.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_ef2a7baba16d466ba893c9cf36ec33a0.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_0015eadf55334ab78eb6819802b4b0ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/selujav.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/spotify_premium_mod_apk_android.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 5852 bytes
SHA-256: 2c65e95884afef35709251afaf6810c80862a88809eeae9e431659378dad8d6e
font_01_sfnt_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 10380 bytes
SHA-256: aa96dbed16a7e26635e0dea4c20d08e71c2cc57ad64860d3894b4036b81b221a

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