Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0d38ec8f8dbc7e…

MALICIOUS

PDF

85.8 KB Created: 2021-03-20 19:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 529be68bb8ca696d18cf6c6122f8eb8d SHA-1: af8776659b2d472610143bd836fea596a34c968a SHA-256: 8e0d38ec8f8dbc7e9e0da3f182548757f3109e65def604c4866ef3f7d6522376
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/wix?keyword=casey+at+the+bat+lesson+plan+common+core
    • https://pudavupotel.weebly.com/uploads/1/3/5/3/135335197/jikelowuwakag_dezowomugir.pdf
    • https://cdn-cms.f-static.net/uploads/4486036/normal_605300f2a9b47.pdf
    • https://kanodofeju.weebly.com/uploads/1/3/5/3/135325650/3927558.pdf
    • https://cdn-cms.f-static.net/uploads/4466367/normal_5fe8940bb40db.pdf
    • https://cdn-cms.f-static.net/uploads/4414352/normal_5fe922623fbed.pdf
    • https://cdn-cms.f-static.net/uploads/4379742/normal_600e393e2ca54.pdf
    • https://static.s123-cdn-static.com/uploads/4464710/normal_6008e4768ef0a.pdf
    • https://static.s123-cdn-static.com/uploads/4425728/normal_5ff96391b9c78.pdf
    • https://tuzatorigipixaz.weebly.com/uploads/1/3/4/3/134321964/510c0c4e1a0678.pdf
    • https://zafubunemajuz.weebly.com/uploads/1/3/5/3/135314528/pemelujav.pdf
    • https://derugipuze.weebly.com/uploads/1/3/0/8/130814861/tivijoliv-jepogedipasop-sabanum.pdf
    • https://busegozujukot.weebly.com/uploads/1/3/0/8/130874370/807053.pdf
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5fce87b3e334b.pdf
    • https://static.s123-cdn-static.com/uploads/4365549/normal_5fe491ea2a555.pdf
    • https://zijananuwale.weebly.com/uploads/1/3/4/4/134438714/xekobo.pdf
    • https://bikewodeganesu.weebly.com/uploads/1/3/4/5/134596115/sogututoxalugi.pdf
    • https://cdn-cms.f-static.net/uploads/4490001/normal_5fd5f8d257291.pdf
    • https://zomasaxejis.weebly.com/uploads/1/3/4/3/134325580/097327.pdf
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fec6ec54a2c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_38cff890328d41f190e4571eaed1a8e5.pdf?index=true
    • http://duvewukabiwetu.epizy.com/abstract_algebra_an_introductory_course.pdf
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_7faa36a1c6b84373b9def3d02dec07b8.pdf?index=true
    • http://delorikafuba.rf.gd/hello_brother_tamil_video_song_hd.pdf
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_85967a389727450d8e626913b00ca3c3.pdf?index=true
    • 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_off00010f89.bin
32d4fe14883c5b983a1e11c83f2276ec834177aec4ca0d2b74244ed1dbd192d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 5320 bytes
font_01_sfnt_off00012174.bin
1c5372799f3efc3e2560e177a3b72c058ac459d281d09707ca8e1a4530c0991a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 11888 bytes

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