Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d09c91de453172e…

MALICIOUS

PDF

78.6 KB Created: 2021-03-24 08:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: af9667f8cb6843effa3165be5775bb90 SHA-1: 171c6aac1c55d9f19b05397110ea8b5fb79d1a66 SHA-256: 5d09c91de453172e1825bb1c7fd485244271a7e134a252bf572e65a3695fd9db
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

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://jumiwimov.ru/wix?keyword=cuales+son+los+dones+de+dios PDF link annotation
    • http://wesused.22web.org/how_to_sign_up_for_salvation_army_angel_tree_dallas_tx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501965/normal_5fcdf36126329.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481164/normal_5ff5f9c65c4c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_60146827a6cbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_604d96c3e9c98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_6000b5663d613.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/verirejon/3d_games_for_pc_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/pulmonary_hypertension_esc_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/how_to_clean_primo_water_dispenser_with_vinegar.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/music_sheet_piano.pdfIn PDF document text
    • http://modenizax.epizy.com/27988397780.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_88a63b6538214478bec55968a828ecb5.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_d7ff5646cb8842f19756117ee1e42d2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/86132658063.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/ecchymosis_plural_form.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/74786742931.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/orangutan_jungle_school_tv_guide.pdfIn PDF document text
    • http://talaxevavilur.rf.gd/vogujalazeri.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/14696161854.pdfIn PDF document text
    • http://jadaxanesutav.epizy.com/94674076761.pdfIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_f6e992e2a17d4091aabfb90b49cb6c2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miledu/whirlpool_70_pint_dehumidifier_wdh70eapw_manual.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_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 4628 bytes
SHA-256: 58e116336e168fab0db953b30ed13bedec74e6d53f175eceba1d7bcc593d8498
font_01_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 11420 bytes
SHA-256: 1a32186931ff5944da558214efb799e7f15201e6d75b69a366f73f0d3f3bbf08

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