Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b3515f5a3a2c1a…

MALICIOUS

PDF

79.8 KB Created: 2021-01-08 19:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c1e8904a04cf50224b571fdf347b3f9 SHA-1: d2a09de3ef0c0481210d4961131ff86b27f8c1ee SHA-256: 88b3515f5a3a2c1a27da7a157147d60a7e8ce81d8c33104ea06b6ef60487f553
112 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a heuristic indicating it's a fake invoice or payment lure. The embedded URL, https://traffset.ru/aws?utm_term=library+automation+software+free++full+version, likely serves as the download source for the malicious payload. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to trick the user into downloading and executing a secondary payload.

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffset.ru/aws?utm_term=library+automation+software+free++full+version
    • https://static.s123-cdn-static.com/uploads/4446286/normal_5fcf20701717b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b866c57c-7077-4e3e-a88f-7663f8032c50/lamatudoloborinud.pdf
    • https://uploads.strikinglycdn.com/files/005a260f-4a15-433d-bd6f-9b08001d4299/rogelepewowugoj.pdf
    • https://uploads.strikinglycdn.com/files/8283eed0-41ae-4912-8247-5cb40cadfdb5/total_war_rome_2_sparta_strategy_guide.pdf
    • https://uploads.strikinglycdn.com/files/e992d2da-5610-4cf9-9fb6-a1362de65349/29604509861.pdf
    • https://s3.amazonaws.com/varolexexus/java_tutorial_free_download_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/cda2a903-5370-45d4-9aae-95e93886a2c8/wivowifiva.pdf
    • https://uploads.strikinglycdn.com/files/a7bb6af1-fed6-4811-87eb-642d13d64874/94611037247.pdf
    • https://uploads.strikinglycdn.com/files/7ea6b60b-b211-4c28-9eee-e38f91cbadbd/tobonexibipixo.pdf
    • https://s3.amazonaws.com/leteraxewe/word_with_vv.pdf
    • https://s3.amazonaws.com/tokafanawa/gigopirizidazegamenomi.pdf
    • https://uploads.strikinglycdn.com/files/3d468b50-d58e-4dcb-8d18-39d82e1a88b4/new_balance_compression_socks.pdf
    • https://uploads.strikinglycdn.com/files/f3962d86-7fd5-4d17-90e0-665dfbcfb898/52442206473.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbbf.bin
0424568f8364ebe0f16fb1a586a543a324212d56a48f3400a096d43060eae209		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 5248 bytes
font_01_sfnt_off00010da0.bin
94723bb4dc87b72d9400f0f3ccbcff147934620293b63ca0a645c979ac4d7fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 10868 bytes

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