Malicious PDF — malware analysis report

Static analysis result for SHA-256 014f266fc11e290d…

MALICIOUS

PDF

76.6 KB Created: 2021-06-03 18:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 620d53352e475e969d5092f852b669db SHA-1: e695d05193c0b227da0ef133b18a62e37fdc8391 SHA-256: 014f266fc11e290dc1da9366cd669d248ee03f20122aeb6f4722b9cee1b810ad
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The heuristic 'PDF_SEO_LINK_FARM' and the large number of extracted URLs strongly indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/pbw?utm_term=how+to+work+out+probability+from+a+two+way+table
    • https://duzebovad.weebly.com/uploads/1/3/4/3/134316699/pemodat.pdf
    • https://cdn-cms.f-static.net/uploads/4422373/normal_603e8405adbc1.pdf
    • https://velademepol.weebly.com/uploads/1/3/1/8/131871907/59dcdbd0f8566a8.pdf
    • https://sulogaxelope.weebly.com/uploads/1/3/1/4/131438888/6d6799.pdf
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/2737991.pdf
    • https://static.s123-cdn-static.com/uploads/4409421/normal_5fc69ca39692e.pdf
    • https://fisiwojaviruf.weebly.com/uploads/1/3/7/5/137511882/bonifelemoxo.pdf
    • https://nimosawi.weebly.com/uploads/1/3/5/9/135982357/3e6ef9ecde642.pdf
    • https://tunozuranoba.weebly.com/uploads/1/3/5/3/135316660/wagabunoto.pdf
    • https://cdn-cms.f-static.net/uploads/4474719/normal_604413ae7cabb.pdf
    • https://cdn-cms.f-static.net/uploads/4413362/normal_6061a699de5f0.pdf
    • https://vigodozoxofi.weebly.com/uploads/1/3/4/5/134599787/a9059f83.pdf
    • https://ligizedafovawu.weebly.com/uploads/1/3/2/6/132680967/wupomoberaje.pdf
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/zeperuzisevizanu.pdf
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5fe2d43d818b4.pdf
    • https://gidakilubokaz.weebly.com/uploads/1/3/4/6/134607675/6330363.pdf
    • https://tovadifu.weebly.com/uploads/1/3/4/0/134096489/3985318.pdf
    • https://cdn-cms.f-static.net/uploads/4425009/normal_602daef6dba51.pdf
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5fdfadfcd6fb6.pdf
    • https://wisefumi.weebly.com/uploads/1/3/4/6/134672277/dosovuxajim.pdf
    • https://wenigekotowas.weebly.com/uploads/1/3/4/5/134576851/polilibafawoleb.pdf
    • https://cdn-cms.f-static.net/uploads/4367938/normal_605fd809a68fe.pdf
    • https://cdn-cms.f-static.net/uploads/4451556/normal_606578d090dac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b4bd4a36-4e18-460b-b020-4afb65958dc6/systems_of_inequalities_word_problems_worksheet_algebra_1.pdf
    • https://uploads.strikinglycdn.com/files/7562b268-94ff-4ea0-a846-859ebbf3732e/what_is_the_most_efficient_water_softener.pdf
    • https://uploads.strikinglycdn.com/files/7d597487-5cff-474c-b883-a15f9db0b5d8/25712095018.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_off0000ee38.bin
3516a4a650f4e3c100daead5f6e1b936ad4f62cba5c6f4abe5c9bf93a0a80272		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 5228 bytes
font_01_sfnt_off00010005.bin
54f2e0bd06cde35f217ff08adcf1f70e4c88c8709de914e6e27bcf1aecc1c625		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 10564 bytes

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