Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce25fe62c8ba0950…

MALICIOUS

PDF

79.5 KB Created: 2021-04-01 04:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e76cf83683d3f27b022d6f12ef65cdcf SHA-1: 52ebbc56630db3b5c1dd599a7e953eb67ee19a15 SHA-256: ce25fe62c8ba0950715ec6d3a10b7b10dc616f3bef1c69eee1248ffba3a2adc8
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=human+respiratory+system+parts+and+functions+pdf PDF link annotation
    • http://bikizugupaka.iblogger.org/boxesobasogoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463807/normal_5fdd010bafc1a.pdfIn PDF document text
    • https://kobamewimituk.weebly.com/uploads/1/3/1/6/131606733/e417aa.pdfIn PDF document text
    • http://dafilor.iblogger.org/27962031050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_600ebd07b055a.pdfIn PDF document text
    • https://zuxorubijif.weebly.com/uploads/1/3/2/6/132695980/dovepekizivexuj_dalubaz_xunifonugiduxog.pdfIn PDF document text
    • https://zisawotagaxikad.weebly.com/uploads/1/3/4/4/134478332/sudewawa.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/eb4f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_ea8acabf683c4a9ea6220610f1525937.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dadupawo/vocabulary_placement_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d640da9-faec-4cdd-bc39-e8a15cc8aa72/jipazuxivakisemamogalax.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/angular_directive_template_dynamic.pdfIn PDF document text
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_d3e86d93b24b4d46809e94776be56858.pdf?index=trueIn PDF document text
    • http://jefebewo.epizy.com/lefowefinegas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a487a2d5-ac87-4cca-a211-2f3e22c044f3/vataze.pdfIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_c4efb29615974a4dba86df054afeffee.pdf?index=trueIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_e0541d4d2ae4423faf36d00641bc2259.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/75102840353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68216c1-1c29-4d83-a8b8-4443cb09c263/59672060603.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 5332 bytes
SHA-256: 965afa55a6687fb0691dea8f76593e8a9b934cfd12264df2c677a026a3fb456f
font_01_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 11260 bytes
SHA-256: afa70c5ee671bdf35f8f5ab312d0196dc5c70f24494d986b01a686bd1c2e1295