Malicious PDF — malware analysis report

Static analysis result for SHA-256 b270d58f0e16b914…

MALICIOUS

PDF

88.7 KB Created: 2021-04-24 00:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7243576f9ad26d1227b9f7824030f13a SHA-1: 25bc7a10052399509bee829bb776cf6f0b5ecfb3 SHA-256: b270d58f0e16b9143b16a3507a2d36ac290d277256911c6f35580443ecaa0cff
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=titanic+song+guitar+tabs+single+string PDF link annotation
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/3302838.pdfIn PDF document text
    • http://samubed.iblogger.org/yard_machine_31cc_tiller_manual.pdfIn PDF document text
    • http://jerijoba.iblogger.org/smart_tv_dongle_android_polaroid_para_tv.pdfIn PDF document text
    • https://burojupudigi.weebly.com/uploads/1/3/5/9/135990051/0d68c83a77.pdfIn PDF document text
    • https://noresewikikizi.weebly.com/uploads/1/3/1/4/131453465/5484080.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/reading_passage_for_ielts_general.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/acaros_parasitologia.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/6c4d06.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/53689841481.pdfIn PDF document text
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/morawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b257c8af-5a55-4501-a2f2-26af61420227/price_of_samsung_smart_tv_32_inch.pdfIn PDF document text
    • https://2cc935b2-b854-4d3d-8499-e3bac5ec7384.filesusr.com/ugd/2e82fc_3b9f6e3f49be4b7299c9813d96faf716.pdf?index=trueIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_c63929c9743945058974dea1ff244c79.pdf?index=trueIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_036b85c8a55f4b41aa8631c0f131ca7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5640472b-51b1-4745-9adf-6ac28d012954/book_of_spells_journal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/472bd661-c3e3-4584-a505-a487fb9f5e41/tipos_de_contratos_reales_derecho_romano.pdfIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_f4efaf0d04dd48a281f013daff67016d.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_0ad5d1abf391419db1206a86db1f861d.pdf?index=trueIn PDF document text
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_e0e489ef1e0b4b139c1b7668a7593b32.pdf?index=trueIn PDF document text
    • http://ketabigumowun.atwebpages.com/tfs_branch_merge_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e771e63b-d901-4143-aa83-172a072a2a0e/mesoxalidipixisejorenul.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_a83efd3829064bf8a6f39e62c4407c98.pdf?index=trueIn PDF document text
    • http://zalenunum.epizy.com/jivuzuso.pdfIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_4346e039ad0a47b09f804fc6d813bb82.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 3996 bytes
SHA-256: 30cadd0ab581fc551350f0ecf848f11b02078118e0c9e056169beb16fb572bb8
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 5056 bytes
SHA-256: 4ed2e9dcfb0b893015b0fd44ef055ffdaaf1a41eae2c9f972de5a4f29b899c0b
font_02_sfnt_off00011890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11890 11452 bytes
SHA-256: 887844462b5a6b5f649313b3b5867aafa337d56422b6970908df20e00f2c0d56
font_03_sfnt_off00013eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EED 16376 bytes
SHA-256: f267a97a42ed964490c0c36cf8d24d30f5cfc386ee24850e75bb3a4991f11828