Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e266d0c328e8b87…

MALICIOUS

PDF

67.5 KB Created: 2021-02-14 05:25:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3c140d90b7d0b2484f6dad8a2182911 SHA-1: 70dfe4569e950030c2fb75c28a06e7862d7b6caf SHA-256: 5e266d0c328e8b87cb045c155668d4e93f6a2ba7905d7ff5f4bfa2f3c9b8b23c
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to leverage external resources for malicious purposes, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=tecumseh+engine+manual+lh195sp
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/5647582.pdf
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/30f8c50d7e.pdf
    • https://static.s123-cdn-static.com/uploads/4375073/normal_5fefcc2136317.pdf
    • https://jaxevilin.weebly.com/uploads/1/3/1/6/131606955/vekodonupum.pdf
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/5220248.pdf
    • http://nazhivy.net/kukezuzibitowulum90nkc.pdf
    • https://static.s123-cdn-static.com/uploads/4367923/normal_5fdef0c043892.pdf
    • http://apelsins.space/numukovenomugapaniteracv19s.pdf
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/1982515.pdf
    • https://cdn-cms.f-static.net/uploads/4447914/normal_601d2703ab3af.pdf
    • https://static.s123-cdn-static.com/uploads/4406776/normal_5fde38a0355a9.pdf
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/saxadoxulesuzipiwul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/guxosa/32642855055.pdf
    • https://s3.amazonaws.com/nalifij/assault_android_cactus_xbox_one.pdf
    • http://zerekigukazaja.epizy.com/stryker_retrograde_femoral_nail_technique_guide.pdf
    • http://rumavajusugeg.rf.gd/vedidoni.pdf
    • https://s3.amazonaws.com/wegemebufojafak/buy_acrylic_sheets_singapore.pdf
    • https://s3.amazonaws.com/viwoxuz/pakusi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf6.bin
8dee5e816cc40ef743b10bc2c7c03cfbb3db3fff7a75dd9308dac0ff26d1b3fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF6 5532 bytes
font_01_sfnt_off0000ddad.bin
a57c8bf668d37d6b325122cb6bbf49719e2b10dadd6ad2dc6125f807a2399d9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 10308 bytes