Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ac7e5704e08741…

MALICIOUS

PDF

76.0 KB Created: 2021-05-30 01:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 235263b0cf9813d0f4ae51215ca6173f SHA-1: 05009f0522ec91e4ee6734d97cb7750774c56c96 SHA-256: d5ac7e5704e0874175da5d22e2c0a526a6e0ba8000b63ec2f3a88d9607c97dda
154 Risk Score

Malware Insights

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

The PDF contains a link to a suspicious domain, identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to resetting a smoke alarm, which is a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=how+to+reset+a+kidde+smoke+alarm In PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_6015ff09a7d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456667/normal_60426d125b1bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fcecbdc39a73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_60680790cac3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_5fdacb86abdc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_605553bd5c6ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_60581acb86eb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417029/normal_6005423165a4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489033/normal_5fef5c8d83023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_6065ada2ad134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_600cfd4fbb924.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420602/normal_60072b0434acd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5ff9b1f4df60a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_60288f127d524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_600f9efa8ab59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450428/normal_601f39c3ba8c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369189/normal_5ff13e395269d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fe674f141a23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5fd1600-8f61-4592-89fb-b3d3127aa449/cisco_sg300-28pp_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a626ed6a-6454-446a-98f3-e28d37e0f33d/a_street_cat_named_bob_age_rating_uk.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_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 5088 bytes
SHA-256: 5b12604beca3104ee89ae27fb716a38e779d02a042e9570d774ab8867ebfbefd
font_01_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 11012 bytes
SHA-256: 7ddf9cddbbe6426ab9af68cd320c65825ee1f4c9b7c736841950e665cf859c37

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