Malicious PDF — malware analysis report

Static analysis result for SHA-256 daaac11368d2a14a…

MALICIOUS

PDF

68.5 KB Created: 2020-11-17 15:27:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a071cb0064b3f15b5f7c94d6a433645 SHA-1: d6bb9335697511a38b9b4626695f8589d6c17f21 SHA-256: daaac11368d2a14a7ef0014a8d7836c62d2b62be69ce7fd683db71e43c3e0bf1
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded URI pointing to 'https://trafffe.ru/123?utm_term=surfside+middle+school', which is a strong indicator of a phishing or malware distribution attempt. The ClamAV detection name 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further supports its malicious nature. No scripts were extracted, but the presence of an external URI in a malicious PDF commonly serves as a lure.

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://trafffe.ru/123?utm_term=surfside+middle+school
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/281abf.pdf
    • https://xalesuben.weebly.com/uploads/1/3/4/3/134368019/zabanujemutew.pdf
    • https://cdn-cms.f-static.net/uploads/4393186/normal_5fa3213e72305.pdf
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5f88ada24b17e.pdf
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f8b64d20dff4.pdf
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/2904914.pdf
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5f8b639a98dab.pdf
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f893743632fa.pdf
    • https://mumetepelexax.weebly.com/uploads/1/3/4/4/134461787/kunotipok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/luborinizu/linear_mdkp_wireless_keypad_manual.pdf
    • https://s3.amazonaws.com/lezopobigeza/economy_of_china.pdf
    • https://s3.amazonaws.com/lorifumofelu/71406770333.pdf
    • https://s3.amazonaws.com/sazariwapa/how_to_get_to_cinnabar_island_red_version.pdf
    • https://s3.amazonaws.com/kulinisokakewi/chemical_formula_worksheet_answers.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b85f.bin
5abc20dce75ae103aed532ec64ce8e81a06333240e2d54cf48f131d93d39be6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB85F 5156 bytes
font_01_sfnt_off0000c9bd.bin
8c3947896e353f4e40c174f3bf1319b2b0102577bba63100affb41c62d2902dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 11304 bytes
font_02_sfnt_off0000efe8.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 16204 bytes