Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f0c0e98506b095…

MALICIOUS

PDF

74.4 KB Created: 2021-01-06 09:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd1b25ce9b3fb65019b36e775e4e5e16 SHA-1: ed1da0f62be67c86a6066c944cffe1b69494868d SHA-256: 38f0c0e98506b0950642db36d601b44afe980f44dd27f550d35a265fecc93da4
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains an embedded URL pointing to 'trafffi.ru', which is likely used to host a malicious payload or redirect to a phishing site. The document body, though partially corrupted, suggests a lure related to humidity measurement, which is a common tactic for social engineering.

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
  • 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://trafffi.ru/123?utm_term=how+to+measure+humidity+in+a+room+without+hygrometer
    • https://cdn-cms.f-static.net/uploads/4428045/normal_5fdac4f549662.pdf
    • https://cdn.sqhk.co/nosuterib/jhbGPze/snowflake_software_stock_symbol.pdf
    • https://static.s123-cdn-static.com/uploads/4418362/normal_5ff217a913302.pdf
    • https://cdn-cms.f-static.net/uploads/4486552/normal_5fb84b35ce165.pdf
    • https://static.s123-cdn-static.com/uploads/4448746/normal_5fcae7867f546.pdf
    • https://cdn-cms.f-static.net/uploads/4383802/normal_5f8faa4c42fb1.pdf
    • https://cdn-cms.f-static.net/uploads/4475720/normal_5fbc6c2469e9a.pdf
    • https://cdn.sqhk.co/gokitoser/qHgjdid/13973682177.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lewuli/36880811706.pdf
    • https://s3.amazonaws.com/goviwigax/mosotazixozodovetebume.pdf
    • https://uploads.strikinglycdn.com/files/8081e04e-0e98-4870-9dbf-36a999a3a1be/xowuxalisojep.pdf
    • https://s3.amazonaws.com/donukadizolin/tuxelusadewa.pdf
    • https://uploads.strikinglycdn.com/files/51a662e8-d768-4883-bc26-d9678f806706/nudupanupaladefonomerox.pdf
    • https://s3.amazonaws.com/daselex/wonibemarogodif.pdf
    • https://uploads.strikinglycdn.com/files/92db3b04-82b7-45f9-8403-4ebe8b7f0e96/3635742376.pdf
    • https://uploads.strikinglycdn.com/files/a2f609d5-6c84-4bc7-908b-320f6bdd0701/82806019498.pdf
    • https://uploads.strikinglycdn.com/files/a20aec13-80d9-492c-99f4-cf8c90bbd955/memes_hub_kenya.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_off0000d8ac.bin
ae036fdf3f02f44015386b05e2033cbc36008f2bfe5091615e5422333dfe1978
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 5244 bytes
font_01_sfnt_off0000ea6c.bin
8e772b63e64ca53ffa543fb0b40d5241eb7cd51cf1d8368ea471fc362585d55c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 10316 bytes
font_02_sfnt_off00010da5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 4324 bytes