Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44a098231ba613f…

MALICIOUS

PDF

87.8 KB Created: 2021-04-05 22:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a866007bb904089cea102f222d2b1370 SHA-1: 73465eff6e66368efc05b1e7ac25827db4a4d3cd SHA-256: d44a098231ba613fce2b38eca2da4fdd4e8d242e13810c3a33142b53406b2f0f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=how+does+sinkholes+happen PDF link annotation
    • http://airned.ru/435634119348ilno.pdfIn PDF document text
    • http://politach.com/voicelive_play_presets_download7di0q.pdfIn PDF document text
    • http://pestore.pro/898817929360yke0.pdfIn PDF document text
    • http://reduslim-buy.site/dragon_professional_individual_v15_french_full_crackthuji.pdfIn PDF document text
    • http://classkaod.ru/lenovo_yoga_c640_specsyuz0y.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/dojivewobasuval/puvagelafep.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/48956408934.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_8718e79f260d48f4a00bea643be863e8.pdf?index=trueIn PDF document text
    • http://leximadibiwojid.epizy.com/bn__h_ni.pdfIn PDF document text
    • http://girifej.epizy.com/bapibi.pdfIn PDF document text
    • http://nanesipub.rf.gd/81171360439.pdfIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_691798ce01aa40a6944f6c4b999bbfe7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/avengers_endgame_movie_poster_hd.pdfIn PDF document text
    • http://zuxulabawiba.rf.gd/38617270991.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/87671061780.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_000e712231f241a7ae1c250ed8e62148.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/wofipubazamowuzemudi.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/45928364425.pdfIn PDF document text
    • http://kawuduzan.rf.gd/dyson_v6_instruction_manual.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_9e9508ec23f84cf0850dd47e7236db2d.pdf?index=trueIn 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_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 5068 bytes
SHA-256: 607c457a072442e281c217247fd16568b08c63818e1ee19a04d749273fa5f582
font_01_sfnt_off0001177c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 10904 bytes
SHA-256: 706c3b19437831f4bd5408cbe1a13681e9b39ad4faf0d38d61a26b0f7e469031
font_02_sfnt_off00013d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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