Malicious PDF — malware analysis report

Static analysis result for SHA-256 96852dfaab1af01d…

MALICIOUS

PDF

68.4 KB Created: 2021-01-09 23:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f1783fef2a6090055fb8fe609e50fb4d SHA-1: b2ce305590d02cb309a157442b8052bfaf1d5aad SHA-256: 96852dfaab1af01d04dda9d211e16d8ab27a44dafc203044cdc5be339e3f363c
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to a known malicious redirector, indicating an attempt to phish or deliver malware. The document body, though heavily obfuscated, suggests a lure related to a 'Mphasis buyback offer letter'. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/aws?utm_term=mphasis+buyback+offer+letter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4492897/normal_5fb5d78b6a24d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5fdc4569284a9.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/bogakusaz.pdfIn PDF document text
    • https://cdn.sqhk.co/disovaje/iW3jfih/niwejinoginomixekava.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/5zGq3Jp/drifters_season_2.pdfIn PDF document text
    • https://site-1178256.mozfiles.com/files/1178256/tesilijezudazoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f99b164a077f.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/ejh9if6/rujoj.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/pujinit/aambala_movie_songs_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/cdc_guide_disinfection_sterilization.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/avery_labels_8660_template.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
    • 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_off0000bb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1D 5412 bytes
SHA-256: 6c8415d8eb88ca23eb92dac2141ab0703f8fda7c9432210c1b8c92b510e2cc3f
font_01_sfnt_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 9864 bytes
SHA-256: b5f2d889e1c00435a4fd68b17f9fe7c725ec590db4aedd6ad0a91811d285a006
font_02_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349

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