Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e3d8fb12c3089e…

MALICIOUS

PDF

88.6 KB Created: 2021-03-16 01:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53568dc9708374963f5f859765a19260 SHA-1: b27e1e28e5109e79872701290283c1f4955f50ae SHA-256: 71e3d8fb12c3089e783b89269f3ddc7db6bece07bdf76af3d2eabb08c3871fd7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary URL pointing to a site that appears to be a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'mobile legends item guide layla' to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=mobile+legends+item+guide+layla
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fc8f8b324f4a.pdf
    • https://cdn-cms.f-static.net/uploads/4412394/normal_601d364ab8387.pdf
    • https://mogobuzuxoxede.weebly.com/uploads/1/3/0/7/130740257/9dfed534c4bce3c.pdf
    • https://cdn-cms.f-static.net/uploads/4459929/normal_601ae8dbb1e7b.pdf
    • https://cdn-cms.f-static.net/uploads/4463528/normal_603c709683042.pdf
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5fd792c199555.pdf
    • https://static.s123-cdn-static.com/uploads/4424043/normal_5fce35b8a697c.pdf
    • https://cdn-cms.f-static.net/uploads/4371508/normal_600a4baba32b5.pdf
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/gupudubututugep-jigenalonurutil-gasekasinebemas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2655ecf1-9703-474a-b0e2-0b118ecac64d/which_of_the_following_is_true_about_the_auditors_observation_of_the_clients_physical_inventory.pdf
    • https://uploads.strikinglycdn.com/files/1afbb5a1-3e15-4fa9-98fa-91c2fe6df6ad/2688157943.pdf
    • https://uploads.strikinglycdn.com/files/ab466472-6b9f-4f8c-8acf-975c21408509/ravipunenegufakunibod.pdf
    • https://uploads.strikinglycdn.com/files/c09bc17c-6176-41ad-a6e7-9b0f47e7a894/ritiwuburufikinevizakop.pdf
    • https://uploads.strikinglycdn.com/files/759d582d-03dc-4d5a-aa1f-f506e66625a5/94376078642.pdf
    • https://uploads.strikinglycdn.com/files/8944347e-c81a-4ef5-99d3-b0a854eec317/51881683431.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_off000112c8.bin
970ecb01832788e446b7e8a61c864256d957989186e1ba6c9393a784b7225556		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 5296 bytes
font_01_sfnt_off000124c3.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 1800 bytes
font_02_sfnt_off00012d53.bin
f2daa5fda00283d57853ec3a9efa24b8debae2bfdf08ce348acc0303c12ffb07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 11056 bytes

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