Malicious PDF — malware analysis report

Static analysis result for SHA-256 da08d8ca051f5fd3…

MALICIOUS

PDF

70.3 KB Created: 2020-12-23 22:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35aebdc1d0633cd97fd86034d2f65bcb SHA-1: 7393fc01cbf9c08f2ea4e71d03a9b305f989286c SHA-256: da08d8ca051f5fd36fa66d254c82c6700509b9f5dbd90859902d4647dce07480
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, characteristic of a link farm designed to host malicious content or redirect users to phishing sites. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://trafftec.ru/123?utm_term=new+concept+english+3+pdf+free+download
    • https://cdn.sqhk.co/zokasejiz/5gdjfUi/40273936466.pdf
    • https://cdn.sqhk.co/vekasurox/Dyiuujg/90885556498.pdf
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/fupekibizu-kiwusimeb.pdf
    • https://pasijafedi.weebly.com/uploads/1/3/4/8/134851145/4412494.pdf
    • https://cdn.sqhk.co/dutebosatu/ggfhgLa/light_me_up_ingrid_michaelson_lyrics_meaning.pdf
    • https://cdn.sqhk.co/dadakafopina/R0K9Zb5/monstera_plant_leaf_brown.pdf
    • https://cdn.sqhk.co/kefexunas/haSNWgg/xojepujanilanukarevufak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d810216-3d52-48e5-9490-42b6d57363ed/96530561882.pdf
    • https://uploads.strikinglycdn.com/files/9ef2111d-25b7-4407-9e64-e9d1be670c81/awaken_spell_5e.pdf
    • https://uploads.strikinglycdn.com/files/892fbd85-43e8-4b1e-b06c-666377871d8c/67123903619.pdf
    • https://uploads.strikinglycdn.com/files/b34d92a1-9870-4bdf-921c-0a193e678142/nuxenosizegabenusoxi.pdf
    • https://uploads.strikinglycdn.com/files/71dae740-40cd-46f2-bc62-360a05f4cc37/32659861608.pdf
    • https://s3.amazonaws.com/wewiro/tv_guide_itvbe_1.pdf
    • https://s3.amazonaws.com/wewiro/62372791592.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b3.bin
74ac8e5e369a0c80263707cb43fc52ba3825fbcf93c9d1e8ef427b5cd1d7c844		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 3564 bytes
font_01_sfnt_off0000d262.bin
f4d3b55cfa875042ac73a27792c28ed87cd3803ac09b785f382a72ccc873e110		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 5644 bytes
font_02_sfnt_off0000e5aa.bin
9de3a1ed831a94053dc2a383863f6dc1d733578e5e94381809399b15cf431c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 11108 bytes

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