Malicious PDF — malware analysis report

Static analysis result for SHA-256 5487ac2b3899578c…

MALICIOUS

PDF

82.5 KB Created: 2021-03-19 03:16:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1cdc79522297426a06c065f8ba16c55 SHA-1: 92c76e0ce7b293c148889c0315c29041b8a6d44b SHA-256: 5487ac2b3899578ccd40e78b06567f988821edc821828f94244cc8583ced92e8
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 of which are dynamically generated, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-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://druttle.ru/award?keyword=nematodes+parasitology+pdf
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/3987622.pdf
    • https://xodefoxewez.weebly.com/uploads/1/3/5/3/135325776/dupemojumefobu_vuduni.pdf
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/jisumotawasaw_kazuzijelos_bazowozazad.pdf
    • https://vowawekalumuz.weebly.com/uploads/1/3/5/3/135304311/4368621.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/litunux/68814751438.pdf
    • https://s3.amazonaws.com/devuxuzejozam/kadajibubetuj.pdf
    • https://uploads.strikinglycdn.com/files/01ab5b9b-f37b-4066-88ea-dde45abdb8ea/jofodo.pdf
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_180e470c7fb14c209cef7a64dc1e8191.pdf?index=true
    • https://s3.amazonaws.com/batoragubukepo/mackie_802_vlz4_mixer.pdf
    • https://uploads.strikinglycdn.com/files/1531f213-b8cb-4da9-9927-9772f79e89af/22325678855.pdf
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_e44a992bdfde4832a4ea807fbb2cdf1d.pdf?index=true
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_7e268512d99e48d3962038c3545bd5fa.pdf?index=true
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_efcb39c33ebe4546adb21c693faf4dc4.pdf?index=true
    • https://264aa3b4-28a3-4a3b-9cf4-afdf28ba9476.filesusr.com/ugd/28a074_78c4350729a840e8b66a11a9ef7b0680.pdf?index=true
    • https://s3.amazonaws.com/susonanezaj/existentialist_s_survival_guide.pdf
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_934921bad19147ebaabd12acf3d895b1.pdf?index=true
    • https://s3.amazonaws.com/ditiruz/47231042631.pdf
    • https://s3.amazonaws.com/perurulexi/how_to_change_head_on_wahl_lithium_ion.pdf
    • https://s3.amazonaws.com/jadudusujuje/vekuxozimov.pdf
    • https://018ae6bf-5b6e-4bf7-bb5f-89503284f855.filesusr.com/ugd/b7931c_b3a6f2c10a224997b4ea1f5ebca41dde.pdf?index=true
    • https://s3.amazonaws.com/fuwawibu/vadebemaxodepopilurukiw.pdf
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_530c7d999fdb4d1c837d2b8de9f6aad2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0109e175-ab4d-4fde-b576-48e48be5bb91/what_are_the_characteristics_of_a_formal_writing_style.pdf
    • https://6f29901e-f5c9-4775-879c-97b2de5c8d5b.filesusr.com/ugd/0bf195_ca794616ab17406c9644ad31e22e1916.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_off000103d3.bin
9a29cecff2251842626ab86ac47d9e3da4feea67a654d310837b09dc954fb692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 5432 bytes
font_01_sfnt_off00011644.bin
feee66d0597068d134b7986dcc4baa380fa98292728e42d85cc04076f582f201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 11256 bytes

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