Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abb9f36c772e28c…

MALICIOUS

PDF

74.1 KB Created: 2020-11-24 13:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 085deecc8f87acdb4aa28850687156b0 SHA-1: 7641ad72589b843a96d5c89400464eed91b0ddfb SHA-256: 7abb9f36c772e28c5c811fab9e48da53519dee4b4356a24cc8a05a3693dac0d9
222 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The presence of a 'download button' heuristic further supports a lure-based attack. No scripts were extracted, but the document's structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?utm_term=advanced+mathematics+precalculus In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5f92c2ab351a2.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/xenatemavejin.pdfIn PDF document text
    • https://xazaguzomolak.weebly.com/uploads/1/3/4/3/134375957/jodaluzobogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f8704dfa7d45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_5f9ebb19d34b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_5fa0573e78391.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/7292536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420765/normal_5fbce77458da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f8728c702414.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/xufoxorog/34435733148.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/61658458523.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/sheets_for_kg2.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/autostart_app_android_tv_box.pdfIn PDF document text
    • https://s3.amazonaws.com/sezutuma/snakes_in_hats_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/zesofezanudeveb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85F 13184 bytes
SHA-256: a358f4c691201c37321fe3810529052df6e5d0c9a0f3eca22ca6ab9ea8a38904
font_01_sfnt_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 5364 bytes
SHA-256: 7f5ca821bd38ca5c43d1cd30de7a92c6400917e01771dc6bcc42f5700b05cc64
font_02_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 10428 bytes
SHA-256: 1103f5edefb90887a494de41895bf1f81ffce3c5c46a9e3f255daa87f12232f6

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