Malicious PDF — malware analysis report

Static analysis result for SHA-256 435887dde569dae6…

MALICIOUS

PDF

81.8 KB Created: 2021-02-15 20:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5d5ed84d299ab88f8382b0ae655ada42 SHA-1: bed02a5ff10a4c4d7599304bdadd175d1d00d48e SHA-256: 435887dde569dae68caa8e06e85a3f259f0e6e9eb1d384ee2532189e56df8ee1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or SEO manipulation tactic. The presence of embedded URLs and the ML classifier's high confidence score further support malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malicious redirection attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wix?keyword=spring+lake+clubhouse+highland+ca PDF link annotation
    • https://warenumew.weebly.com/uploads/1/3/4/8/134871813/wuzexewuzumoxapeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5fcacac866d8d.pdfIn PDF document text
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/b41a23dbb27a.pdfIn PDF document text
    • https://zezodejesamibiz.weebly.com/uploads/1/3/1/1/131164097/gineb-wetisebeveted-rikonikomas-mitivodabavevet.pdfIn PDF document text
    • https://dizufarul.weebly.com/uploads/1/3/1/3/131379939/zovawu_savifinole_xidaterome.pdfIn PDF document text
    • https://jatufabafalili.weebly.com/uploads/1/3/1/6/131637938/mivavujokonararopet.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/dudup_riramanumovu_puvudelam_jijimawetotiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_60080d04860c4.pdfIn PDF document text
    • https://tilakajunobeka.weebly.com/uploads/1/3/0/7/130739719/7750616.pdfIn PDF document text
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/mujaduduzido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_601ef14197e9e.pdfIn PDF document text
    • https://rajuputodetu.weebly.com/uploads/1/3/4/6/134682309/tekodowazesos-leripekefe-monekawaraniro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/xelalogagewomimosutib.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/48304080231.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/vawidovinirekuvaserunu.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/bulb_smash_apk_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/co_state_patrol_accident_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/zisawisowogaranow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 5444 bytes
SHA-256: f0af8b62f0c07a045ac1cc343b8eaa58edb4e4c03898f589405e0991d74ef9c2
font_01_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10664 bytes
SHA-256: 33babf1b44d919d1e5b66020f67dea5f6638c0bdca8741b12f2c40178ef10a5d
font_02_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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