Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45e1eda1c66218b…

MALICIOUS

PDF

79.1 KB Created: 2020-12-15 19:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a154c0de8349907b43de3145c5da9b47 SHA-1: ef353b85fc71cc7791790a596a443e8b26a7fc8b SHA-256: b45e1eda1c66218bf6c59d5cec9a0dac74afd363c742ed250501665d44f50852
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with one pointing to 'traffine.ru', suggesting an attempt to redirect users to a malicious site. The document body, though heavily obfuscated, contains text related to an academic institution, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=stem+academy%252Finstitute+fond+du+lac+wi
    • https://cdn-cms.f-static.net/uploads/4378167/normal_5f908079b80f8.pdf
    • https://wukodotimage.weebly.com/uploads/1/3/4/4/134487216/daxabowekibasuf.pdf
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5fcf08988bd1d.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0d52e3dfdd95b60d4bb65/t/5fc397523570fb44d171a159/1606653779033/diburafalalavegomuriju.pdf
    • https://s3.amazonaws.com/warapagefasovi/mitezonuvukesomu.pdf
    • https://s3.amazonaws.com/lukepepe/words_that_start_with_nib.pdf
    • https://s3.amazonaws.com/pisedij/mojeneku.pdf
    • https://static1.squarespace.com/static/5fc526b588c99b6d37c2ed9a/t/5fcdbe29d336b863f0e1d650/1607319082070/paweluzotetef.pdf
    • https://uploads.strikinglycdn.com/files/eb8fc88e-82c4-4246-bf2c-bc3de7bab06e/bofoxonu.pdf
    • https://static1.squarespace.com/static/5fc0d4a28139af037644e7e6/t/5fc2fedd18e72e5fdb3b020c/1606614766365/waden.pdf
    • https://s3.amazonaws.com/mipizaju/42794183123.pdf
    • https://s3.amazonaws.com/fewifuwu/azar_modded_apk_free.pdf
    • https://static1.squarespace.com/static/5fc0ead76b97992eb55c27e3/t/5fc6a29a173fb5383b8dcb95/1606853274786/stickman_zombie_shooter_unlimited_money_download.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000cd50.bin
52dd3f06d44a2de594a0fe7e371ee9fd32d096ace02f9b492883b55cdfb00ce6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCD50 14052 bytes
font_00_sfnt_off0000bae9.bin
61b377c2e239a5cea6e50eeb23c6ce12f8f0a184b7923060510c20beadeba0b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE9 5404 bytes
font_02_sfnt_off0000f4b3.bin
b2870596e683e3d569662c13f24bfa2e27512e0c59b78ed005def4ccce8c5cbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 11132 bytes
font_03_sfnt_off000119b5.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 16204 bytes

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