Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f72d4b5a0473b11…

MALICIOUS

PDF

89.1 KB Created: 2021-04-04 04:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: be24611bff2b94fd46171a99b28b204b SHA-1: 044d8e80db12200ef880f4d88bce139b084441b8 SHA-256: 9f72d4b5a0473b11271b71113dd8b94556800a083348914b6c2dc0ab7a6f326e
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/strik?utm_term=is+enfp+compatible+with+enfj PDF link annotation
    • http://tufuwavaziga.mygamesonline.org/53468593210.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/biochemistry_textbook_lehninger.pdfIn PDF document text
    • http://monubagujizud.mywebcommunity.org/sex_and_the_city_season_1_episode_12.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/nazeti.pdfIn PDF document text
    • http://paworupuwiwitew.iblogger.org/1044970232.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d66045e-c276-4037-81df-184b25840e97.filesusr.com/ugd/cdf3e3_e2d9cab09e6748adb8e1751dd24fc13a.pdf?index=trueIn PDF document text
    • http://fovenipeder.rf.gd/oxford_dictionary_english_to_bangla_download.pdfIn PDF document text
    • http://zapidijerazavot.epizy.com/89794966363.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_a62e6ba2d1354b5ab5f3de305cd767e0.pdf?index=trueIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_f0cad99aa111439d83e54200244cf6e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c08ce3-a499-4da4-b1d8-0a93576e30ce/dofixarafiradosufemanajas.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_69621ff6e26b46a9bac67948428f96f7.pdf?index=trueIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/tamaginutitakokogoxiraga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc00faf5-3c9f-433c-a4df-d4589d09c8c2/sigem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a677196b-45bf-475c-a7b7-3b552821577f/how_to_make_bat_stickers_at_home_easy.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_0e09192191734815ae6e72220722d1b2.pdf?index=trueIn PDF document text
    • http://josesawi.epizy.com/bank_book_download.pdfIn PDF document text
    • http://ribowiga.epizy.com/how_to_steam_chicken_in_aroma_rice_cooker.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_89ab08a6d04b45e9ad88234c4cffa659.pdf?index=trueIn PDF document text
    • http://xuvemotoguno.epizy.com/jotajufed.pdfIn PDF document text
    • http://kupuwatuz.epizy.com/mavisagimij.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_484edf15702a4d9698da991ce99cf604.pdf?index=trueIn PDF document text
    • http://befugoj.epizy.com/xurotawejizerudese.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_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 5404 bytes
SHA-256: f6a7054c0d220ba0607f12cb823174cd2a732b730553a1f7f2702ed1348a65a2
font_01_sfnt_off00013106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13106 10576 bytes
SHA-256: 61c72dabd2226c220dea6e2e13cc5b8410eb338ee1dd3c703b2c5becf8222ed0